Home

Instruction manual, model 4000SU FMOspl

1. Figure 5 3 2 2 1 Brief Description of Fixation Algorithm Criterion 1 is used to determine when a fixation starts Criterion 2 is used to determine whether subsequent data samples are part of the same fixation and Criterion 3 is used to determine which data samples should be averaged together to determine the final fixation coordinates The quick description is as follows To start a fixation the program looks for a specified period MIN SAMPLE during which gaze has a standard deviation of no more than a specified amount Criterion 1 To end the fixation it looks for a specified number of sequential gaze position samples MAX COUNT to be farther than a specified distance Criterion 2 from the initial fixation position The final fixation position is the average position of all data samples between the beginning and end of the fixation The exception is that any gaze coordinates that were farther than criterion 3 from the initial fixation position are not included in the average For more information please see section 3 2 2 3 and a detailed explanation in section 3 2 5 3 2 2 2 Fixation Criteria Menu Options The following is a list of the adjustable settings of the Fixation Criteria Menu including those for the fixation detection algorithm The criteria are listed as they appear in the Criteria menu figure 4 14 EYENAL MANUAL Min Sample To start a fixation the program looks for a specified period MIN SAMPLE during whic
2. Fixation Properties Tie Start Stop Criteria START POINT Segm Start delay STOP POINT 1 Segm 96 ie 96 Duration 8838 Flags Use start flag M 6 Mak C XDAT Value o Use stop flag M Mak XDAT Value o Allow multiple starts Cancel Apply Help Figure 4 c Allow multiple starts If this box is checked Eyenal will begin analyzing the raw data the first occurrence of a specified start flag and stop at the specified point then continue to look for subsequent occurrences of the specified start flag and create multiple segments on the resulting Fixation file NOTE start and stop flags may be combined with Start and Stop Points 13 EYENAL MANUAL 3 2 2 Fixation Criteria The Fixation Criteria menu allows the user to set parameters used by the algorithm to detect a fixation Fixation Properties Title Start Stop Criteria Min sample Max count E blink fi 2 Fixation Algorithm Criteria Degrees Eye Tracker 1 2 3 Units degree Vertical 05 fi r5 fio Horizontal 05 fi r5 fio Zero Time Origin Pupil scale factor fi Compute max fixation duration Restore Default D Badia Restore Defaut Values Scene Boundary Limits M REAY Sinbeserncvvasavese ns tiii eta vna duri t saa raagis rera Top fo Bottom 270 Cancel Apply
3. 125 000 134 833 169 250 10 5 26 26 126 627 138 673 162 082 Segment 2 11 5 26 28 E 127 923 134253 160319 Segment 3 12 5 26 30 124657 122 314 150771 Segment 4 13 5 26 30 126091 133182 158455 Segment 5 14 5 26 31 125 529 134 059 168 529 Segment 6 15 5 26 31 i i 131 870 135870 170261 Segment 7 16 5 26 32 139 929 133571 169 179 Segmenta 17 5 26 32 34429 224714 123857 z os 18 5 26 33 i 25188 230 688 119375 13 5 26 33 f 125 625 126 000 152 125 Segment 10 20 5 26 33 133470 128 672 Segment 11 m c 4 9 4 0 Segment 12 segment start 05 26 20 767 a segment_end_time 05 26 59 867 segment_duration_time 00 00 39 117 number of fixations 51 nii p Eyenal example_eyd File Edit View Fixation 01 Fseg Dwell Pupil Batch Window Help ojee Sale 12 E example eyd aoi file title example aoi Segment 1 soi file name C New Folderwexample aoi B example fix fix file title Segment 1 fix file name C New Foldervexample fix example aoi faq Seg Fix Pin 01 01 Name Stt Time Fix Dur InterFis Dur InterFix Dea E example eyd 0 3 text 15 44 45 0167 0 000 0 000 Segment 1 15 44 asik 0 4 logo 154446 0 500 0 067 8 980 Segment 1 0 0 off 15 44 47 0 583 0 050 6 570 E example pda 2 0 4 logo 15 44 48 01
4. E example fix fsq segment number 1 Segment 1 aoi file example aoi example aoi example fsq E Segment 1 1 3 15 44 46 La a poete 2 4 logo 0 154446 0500 15 44 47 0 067 0 t 3 0 off 0 15 44 47 0583 1544 47 0 050 0 4 4 logo 0 15 44 48 0133 15 44 48 0 033 0 5 0 off 0 15 44 48 0150 15 44 48 0 050 0 6 2 left nav 0 15 44 48 0 450 15 44 48 0 067 0 0 off 0 15 44 43 0 350 15 44 43 0 267 0 8 3 text 0 15 44 43 1 067 154450 0 267 0 3 0 off 0 15 44 50 0150 154451 0 017 0 10 3 text 0 15 44 51 3183 15 44 54 0 017 0 11 4 logo 0 15 44 54 0200 15 44 55 0167 0 12 0 off 15 44 55 0383 15 44 55 0 050 0 13 4 logo 0 15 44 55 0 333 15 44 55 0 033 0 14 0 off 0 154455 0 867 15 44 56 0117 0 15 2 left nav 0 15 44 56 0 383 15 44 57 0 083 0 16 0 off 15 44 57 0183 154457 0 150 0 17 2 left nav 0 15 44 57 1257 15 44 59 0 067 0 18 0 off 15 44 59 0 167 15 44 59 0 217 0 19 3 text 0 15 44 59 0250 15 44 59 0 067 0 2 004 0 154459 0250 15480133 0117 0 Figure 17 E e ample eyd Navigation Salinas example fix Segment 1 Left click on the sign to extend the Dwell file tree B example fsq Left click on any of the subsequent files to view contents 89 Segment 1 B example dwl ADI summary Transition table Conditional probability 6 3 1 Dwell Sequence Summary Jere proba Diny Histogram 1 Histogram
5. created by FIX section 3 0 with Areas of Interest files created by AOI section 4 0 FSQ determines the sequence of the areas fixated a summaty of the total time and percent of time spent fixating each area and other summary statistics In addition the program calculates joint and conditional probability distribution between areas of interest Output is to the monitor screen a printer and or an ASCII file as desired Fixation Sequence Properties 5 2 Making a Fseq File General To make an Fseq file Fue gi 1 Open desired Fixation file eames SS 2 Open desired AOI file a 3 Select the Fseq pull down menu Code 4 5 Choose new fixation sequence file Segm 1 E Delay secs Once Fixation Sequence Properties STOP POINT menu pops up pops up Segm 1 Duration secs 933 d Fseq Properties window should q P TUN 1 Zero Time Origin display the names of the desired Fix and Segm AOI files input files es These are the input files Cancel e FSQ file This is the output file name The default name will be taken figure 9 from the current Fix file and given a fsq extension If desired rename the output file f Code Information typed here shows up in the file header g Title Information typed here shows up in the file header h Start Point A Fseq file can be made with only a portion of the fixation sour
6. 2 Histogram 3 Histogram 4 31 EYENAL MANUAL The program lists the following summary information for each dwell FSC data segment processed and for each defined Area of Interest AOI To view the Dwell Sequence Summary left click AOI Summary in the Dwell file tree gt Area of Interest AOT area number name and scene plane number Area number zero 0 always represents an undefined dwell area off the scene gt The total number of Dwells occurring in the Area of Interest gt The mean average Dwell duration and standard deviation in seconds gt The median dwell duration in seconds gt The skew value difference between the mean and median duration for the Area of Interest E Eyenal example eyd 8 73 Eile Edit View Fixation Fseg Dwell Pupil Batch Window Help ojala alas hel El example Segment 1 B example fix Segment 1 example aoi Fix Dwell Sequence Area of Interest Summary AOI AOI Pin Dwl Mean Dwi E Segment 1 off 13400 E example dwl BET E Segment 1 text 6 000 logo 5 000 Transition table Conditional probability Joint probability Histogram 1 Histogram 2 Histogram 3 Histogram 4 Figure 18 6 4 Dwell Transition Table The Transition Table is a matrix representing the actual amount of transitional activity between Areas of Interest AOI s A transition from i to j is the change fro
7. 3 2 I Alsegments Double Click on file to change output file options Help Output File Name Title Code Start Point by Segment or delay in secs Stop Point by segment or duration in secs 7 set Fixation Criteria for the selected files left click the tab labeled Batch Fixation Options at the top of the Batch properties pop up menu For more in formation on Fixation Criteria GO TO section 3 2 1 37 EYENAL MANUAL 8 2 2 sb IN S NOTE the Batch function will now create fixation files for each selected source file based the specified parameters and criteria These files will be located in the specified source directory Batch Fixation Sequence Files Select Batch Fix Sequence from the Batch pull down menu Select the desired AOI file from the Windows browser Once the Batch Properties menu pops up Select the desired Source directory Select the desired Output directory All eyd and ehd files located in the source directory will be listed below Select desired source files To include a file for Batch leave a red check mark next to the file name To exclude A File from Batch double click on the red check mark to remove it 8 To add or change the below listed items for individual output files A Double click on the desired output file name B Change or adjust desired field in the resulting Properties pop up window and click APPLY For further explanation of
8. The Batch function allows the user to create Fixation Fixation sequence and Dwell files for any number of selected EHD or EYD files in a given directory 8 2 Using the Batch Function 1 Select the Batch pull down menu 2 Select the desired output file format Fixation Fix sequence or Dwell for Batch 3 If the desired output file format was Fixation file GO TO section 8 2 1 Fix Sequence file GO TO section 8 2 2 Dwell file GO TO section 8 2 3 8 2 1 Batch Fixation Files 1 Once the Batch Properties menu pops up Select fles Batch Fixation Options Source Directory 2 Select the desired Source directory CAProgram Files ASL Eyenalh Output Directory 3 Select the desired Output directoty C Program Files ASL Eyenal 4 All eyd and ehd files located in the source directoty 5 s21 ey s21 fix RS3 eyd 53 1 1 will be listed below Y RS2 eid BS2 f 1 1 RS1 eyd RS1 fix 1 1 1 v RS5 eyd 55 1 1 5 Select desired source files 929 _ Bei 1 1 To include a file for Batch leave a ted check mark 1 1 next to the file name To exclude A File from Batch double click on the ted check mark to remove it 6 add or change the following items for individual output files A Double click on the desired output file name B Change or adjust desired field in the resulting PM Properties pop up window and click APPLY For further explanation of the listed items GO TO section
9. between other pairs of areas No of fixation transitions from Ai to Aj 000 Total number of transition pairs Reading the Joint Probability Table This table reads the same way as the transition table except that it is a matrix representing the joint probability of transitional activity between Areas of Interest AOT s 29 EYENAL MANUAL 6 Dwell Statistics 6 1 Purpose and Application The DWELL function computes various statistics from the FSEQ section 5 0 function Definition A dwell is defined as the time period during which a fixation or series of contiguous fixations remain within an Area of Interest AOT as defined by the AOI section 4 0 function The dwell data output is comprised of a sequential list of dwells a summary of dwell activity in each AOI a Transitional Matrix a Conditional Probability Matrix a Joint Probability Matrix and Histogram data that can be plotted in Excel 6 2 Creating a Dwell File To create a dwell file 1 2 3 4 Select the Dwell pull down menu Choose Make new D well file Once the Dwell Properties menu pops up review the listed properties Fsq File Browse to the desired Fseq file If an Fseq file is currently open this will be the default file This is the input file NOTE to open a Windows browser left click the icon on the right of the text Dwell Title Any information typed here will show in the file header Dwell File select a name
10. distance in inches or centimeters horizontally between two known scene points such as the points 5 and 6 on the calibration chart Call this dh Measure the distance in inches or centimeters vertically between two known scene points such as the points 5 and 2 on the calibration chart Call this Use the Set Target mode of the Eyetracker Software while observing the scene monitor Now measure the distance in Eyetracker units horizontally between the two known scene points points 5 and 6 on the calibration chart Call this Next measure the distance in Eyetracker units vertically between the two known scene points points 5 and 2 on the calibration chart Call this ETv Find the angle whose tangent is dh s and call this 9h Find the angle whose tangent is dv s and call this Ov Divide ETh by 0h This is the value of eye tracker units per degree visual angle along the horizontal axis Divide ETv by Ov This is the value of eye tracker units per degree visual angle along the vertical axis 3 2 4 Sample Calculations of Eye Tracker Units per Degree Visual Angle The following are sample calculations to determine eye tracker units per degree of visual angle Sample Measurements 18 EYENAL MANUAL s Eye to center of scene distance 28 inches dh Horizontal distance from calibration point 5 to point 6 8 inches Eth number of horizontal eyetracker units between points 5 and 6 120 Eye
11. file name and number of segments will appear in a file tree format on the left side of the program screen A segment is considered the length of time between a start and stop of recording on the same data file Depending on the system configuration used while recording data these columns will differ from figure 1 2 1 1 Eyedat Files An Eyedat file the standard type of file recorded with ASL s remote table mounted pan tilt or Long Range optics has a eyd extension A standard Eyedat file will have nine data columns 1 Field No A field refers to the data items recorded for a single sampling interval A sampling interval is a 50 60 120 or 240 of a second depending on the model eye tracker system used A field contains eight pieces of data represented by rows 2 Segment No A segment is a continuous section of recorded data Every time data recording is paused and restarted without closing the data file a new data segment is created on that file so a data file may have one or more segments This column will list the segment of the data file containing the corresponding field row of data All files have a segment maximum of 169 Note segments exceeding approximately 5 min may be divided into pseudo segments which count toward the segment maximum 3 Time PC time of day hours minutes seconds at which the field was recorded 4 Total Seconds Same as Time but displayed as the number of seconds since midnight 5 H POS Horizo
12. for the output file or keep the default name The default name will be the same as the selected Fseq file Powel Properies 4 Dwell Properties File Jexample fsq Dwell File El DwellTitle Segments Number of segments in FSQ file 1 Start segment 1 Stop segment 1 4 Cancel Figure 16 gt Segments If desired select a start and stop point based on the input file segments Click OK 6 3 Dwell Sequence List Once is selected the program lists the following information for each dwell sequence 30 EYENAL MANUAL 1 Dwell No Dwell number 2 AOI No Name Area of Interest AOI number label and scene plane number scene plane numbers only apply for EYE HEAD data files that contained the dwell 3 Start Time Dwell start time listed in hours minutes and seconds 55 555 4 Dwl Dur Dwell duration in seconds This is the sum of all the Fixation duration s that make up the dwell 5 Stop time Dwell stop time listed in hours minutes and seconds 55 555 6 InterFix Dur Inter fixation length in seconds for each dwell shift between two AOT s 7 No of flags example eyd 8 53 File Edit View Fixation AO Fseg Dwell Pupil Batch window Help laj x Distal ales gt ep example eyd fsq file name C New Folder example fsq Segment 1 fsq file title
13. over any bitmap image rather than define them with coordinates AOI files made using Fixplot can be used in EYENAL See the Fixplot manual for further information 4 2 Creating an AOI file To create an AOI file Area of Interest Properties ADI 1 Open the AOI pull down Menu 22 File Name Number of Als f Number of fi 2 Select Make new AOI file wu eene r1 ADI 2 Tite ADI Scene plane E 3 Once the Area of Interest Properties menu pops E LL COC SS up fill in the appropriate information and Top 5 coordinates Proceed as follows NEM me A File Name enter a name for the new AOI Bottom O file to be created NOTE if a data file is currently open the program will display a default file name The default file name will be the data file title with an aoi extension Eyehead Integration Data T New Delete If using EYEHEAD Integration data figure 7 21 EYENAL MANUAL check the box in the bottom right of the menu C Title enter the title for the first area you wish to create This name will be given to the area designated in the AOI N area of interest number box D Scene Plane If using EYEHEAD Integration data only If using EYEHEAD data specify the scene 0 19 that contains the current Area E Top enter Top coordinate F Left enter Left coordinate G Right enter Right coo
14. the listed items GO TO section 5 2 Output File Name Title Code Start Point by Segment or delay in secs Stop Point by segment or duration in secs Click OK NOTE the Batch function will now create Fixation Sequence files for each selected source file based on the specified parameters These files will be located in the specified source directory 8 2 3 Batch Dwell Files Xr os 09 559 Select Batch Dwell from the Batch pull down menu Once the Batch Properties menu pops up Select the desired Source directory Select the desired Output directory All fsq files located in the source directory will be listed below Select desired source files To include a file for Batch leave a red check mark next to the file name To exclude A File from Batch double click on the red check mark to remove it 38 EYENAL MANUAL 7 add or change the below listed items for individual output files A Double click on the desired output file name B Change or adjust desired field in the resulting Properties pop up window and click APPLY For further explanation of the listed items GO TO section 6 3 Output File Name Title Code Start Point by Segment or delay in secs Stop Point by segment or duration in secs 8 Click OK NOTE the Batch function will now create Dwell files for each selected source file based on the specified parameters These files will be located in the specified source directory 39
15. 33 0 033 3 370 Segment 1 pines 0 0 off 15 44 48 0150 0 050 6 220 E example fsq 8 2 left nav 15 44 48 0183 0 067 4 520 E 0 2 left nav 15 44 48 0 267 0 017 1 460 ADI summary 0 0 off 15 44 49 0 117 0 267 6 940 Transition table 0 0 off 15 44 49 0233 0 083 10 570 eit 3 L3 1545437 0157 007 7010 E Es probabit 3 text 15 44 50 0 200 0 050 4 430 0 3 text 15 44 50 0117 0 017 1 840 E Segment 1 0 3 text 15 44 50 0 183 0 017 2 680 ADI summary 0 3 text 154450 0217 0 017 1 480 Transition table 0 0 off 15 44 50 0 150 0 017 1 830 Conditional probability 0 3 text 15 44 51 0100 0 017 1 610 Joint probabilit 0 3 text 15 44 51 0 167 0 017 1 080 escent 3 text 15445122 0 333 0 083 3 060 Fi 0 3 text 154451 0117 0 017 1 690 istogram 2 A Aen TES Asan Histogram 3 Histogram 4 44 46 567 D PHA EYENAL MANUAL 1 1 File Naming Conventions Some ASL analysis program features recognize certain file name extensions for performing certain tasks The following convention is used by ASL software ASL s EYENAL FILE NAMING CONVENTIONS DESCRIPTION FILE TYPE Eye data recotded by series EYEDAT 5000 EyeTrackers models 1050 Pupillometers and 210 DARS programs Integrated EYEHEAD position EYEHEAD data recorded by an Eye Tracker with a MHT Magnetic Head Tracker and EYEHEAD Integration software Files created by EYENAL AOI AREAS specifying rectangular areas of interest on t
16. EDAT data sample is between the defined Blink Minimum and Blink Maximum number of fields than the losses are considered a blink A number of consecutive lost fields less than the minimum or greater than the maximum are considered losses The Blink frequency result for a EYEDAT data sample selection is calculated as number of blinks in data sample blink frequency sample duration in seconds 3 Click OK 7 3 Pupil Diameter Sequence List Once a pda file is made the program will display a list of each data field selected and the corresponding pupil diameter see figure 20 7 3 1 Pupil Data Summary List The Pupil Diameter Summary lists the following statistics based on the specified parameters The data summary includes the number of samples mean median and standard deviation of pupil diameter values for the selected data sample The Blink Frequency calculation is also included in the data summary 35 EYENAL MANUAL Note Pupil diameter values of zero loss are not included in calculations of the statistical values listed above Y Eyenal 851 example evd Segment 1 El example pda 0 45 H T 4 8 2 45 3 45 4 45 5 45 6 45 7 45 8 45 45 104 1 44 42 45 13 45 14 44 15 45 1 44 17 45 18 45 19 Figure 21 36 EYENAL MANUAL 8 Batch Function 8 1 Purpose and Application
17. Eyenal Manual Windows for use with ASL Series 5000 Manual Version 1 3 EYENAL MANUAL TABLE OF CONTENTS Table of Contents 1 INTRODUCTION 1 1 File Naming Conventions 2 VIEW RAW DATA FILE 3 CALCULATE FIXATIONS 3 1 Purpose and Application 3 2 Making a Fixation File 3 2 1 Start Stop Criteria 3 2 2 Fixation Criteria 3 2 2 1 Brief Description of Fixation Algorithm 3 2 2 2 Fixation Criteria Menu Options 3 2 2 3 Fixation Algorithm Criteria Description 3 2 3 Visual Angle Computation 3 2 4 Sample Calculations of Eye Tracker Units per Degree Visual Angle 3 2 5 Detailed description of Fixation Algorithm 4 DEFINE AREAS OF INTEREST AOls 4 1Purpose and Application 4 2 Making an AOI File 4 3 Editing an AOI File 5 FIXATION SEQUENCE ANALYSIS AREA OF INTEREST STATISTICS 5 1 Purpose and Application 5 2 Making an Fseq File 5 3 Viewing Fseq file output 5 3 1 AOI Summary 5 3 2 Transition Table 5 3 3 Conditional Probability table 5 3 4 Joint probability table 6 CALCULATE DWELL STATISTICS Applied Science Laboratories 175 Middlesex Turnpike Bedford MA 01730 ASL308 M 976 970728 Copytight c 2001 by Applied Science Group Inc EYENAL MANUAL 6 1 Purpose and Application 6 2 Making a Dwell file 6 3 Dwell Sequence List 6 3 1 Dwell Sequence Summary 6 4 Dwell Transition Table 6 4 1 Dwell Conditional Probability Table 6 4 2 Dwell Joint Probability Table 6 4 3 Dwell Histograms 7T CALCULATE PUPIL STATISTICS 7 1Purpose and Appli
18. L MANUAL Note that actually this is the maximum possible fixation duration since it assumes that the fixation stated at the beginning of the first sample and ended at the end of the last of these samples The uncertainty associated with taking discrete samples means that this fixation could actually be as short as 160 ms starts near the end of the first sample and ends near the beginning of the last sample or as long as 200 This version of Eyenal ver1 28 chooses the mid range possibility and reports 180 ms in this example Currently Eyenal will use the format of the mid range possibility when computing fixation duration and includes an optional check box to compute the longest possibility as was the case with all previous versions of Eyenal both DOS and Windows gt Detect CR Loss Head mounted eyetrackers E g model 501 can measure line of gaze although with reduced accuracy even when only the pupil is recognized Remote non head mounted systems which permit motion of the head with respect to the eye camera E g model 504 cannot make a reasonable gaze measurement unless both the CR and pupil are recognized When a remote system recognizes the pupil but not the CR it continues to report a valid pupil diameter but sets eye position values to default values These default coordinates are 2 0 for series 5000 systems and twenty 20 for series 4000 systems If Detect CR Loss is enabled eye position coordinates of these defa
19. al distance DX DY of the next data sample from the temporary means XT YT If DX DY is less than criterion 2 the sample is included in the fixation If it does not pass criterion 2 then the next sample is tested against criterion 2 This process is continued until a measurement sample passes criterion 2 or until max count sequential samples default value of three can be changed by the user have been tested If one of these 19 EYENAL MANUAL measurements does fall within criterion 2 previous samples that did not are tested against criterion 3 All of the samples that pass criterion 2 or 3 are then considered to be included in the fixation This means that they will be used in the final calculation of fixation position If DX and or DY from max count sequential samples exceed criterion 2 then the X and Y means of these samples ate calculated If the means do not differ from XT and YT by more than criterion 2 they are all included in the fixation otherwise the fixation is closed at the last acceptable data sample Blinks defined as pupil losses of max blink samples or less are ignored and do not terminate a fixation Note that a number of samples equal to about 200 msec is the recommended value for maximum blink duration This value may be reset as described in Section 3 2 2 Pupil loss for periods longer than max blink do cause a fixation to close at the last acceptable data sample 20 EYENAL MANUAL 4 Def
20. beginning of current fixation in seconds Interfixation distance between current and previous fixation in degrees visual angle Scaled pupil diameter Eye to Scene Plane distance in inches or centimeters This item is valid only for EYEHEAD data NOTE that scene plane number and eye to scene plane distance apply only to EYEHEAD data PETERE ER File Edit View Fixation Fseg Dwell Pupil Batch Window Help l x olsa ee alal eel El example eyd aoi_file_title example aoi Segment 1 aoi_file_name C New Folder example aoi B example fix fix file title Segment 1 fix file name C Program Filesv amp SL Eyenalvexample fix example aoi E example fsq Segment 1 L 1550 2 0 067 2o 15502 0 450 2 0 317 0 217 0 383 0 917 0 267 0 217 0 617 0 050 1 117 1 050 0 117 0 183 1 283 0 133 0 717 0 767 0 400 0 317 0 483 0 250 oooooooooooooooooooooto segment_start_time 15 50 02 000 segment_end_time 15 50 23 317 segment_duration_time 00 00 21 317 number of fixations 41 For Help press F1 Figure 10 25 EYENAL MANUAL 5 3 2 Fixation Sequence Segment Summary The program lists the following summary information for each segment of data processed Segment start time stop time and length of the data segment Total number of fixations processed and the mean fixation duration in seconds gt Fixation Frequency average number of fixations per second during
21. cation 7 2 Making a pda file 7 3 Pupil Diameter Sequence List 7 3 1 Pupil Diameter Summary List 8 BATCH CAPABILITY 8 1 Purpose and Application 8 2 Using the Batch Function 8 2 1 Batch Fixation Files 8 2 2 Batch Fixation Sequence Files 8 2 3 Batch Dwell Files TABLE OF CONTENTS EYENAL WINDOWS MANUAL TABLE OF FIGURES Table of Figures Figure 1 Sample Eyedat file for model 504 with MHT Option Figure 2 Sample EYEHEAD data file Figure 3 Fixation Properties General pop up menu Figure4 Start Stop criteria menu Figure 5 Fixation Properties CRITERIA menu Figure 6 Fixation Algorithm Criteria Criteria menu Figure 7 AOI Properties menu Figure 8 Sample AOI File Figure 9 Fixation Sequence Properties pop up menu Figure 10 Sample Fixation Sequience List Figure 11 Sample Fixation Sequence Summary Figure 12Sample Fseq Summary Table AOI Summary Figure 13 Sample Fseq Trabsition Table Figure 14 Sample Fseq Conditional Probability Table Figure 15Sample Fseq Joint Probability Table Figure 16 Sample Dwell Properties pop up menu Figure 17 Sample Dwell Sequence List Figure 18 Sample Dwell Sequence Summary Figure 19 Sample Dwell Histogram data Figure 20 Pupil Diameter Analysis pop up menu Figure 21 Sample pda file Pupil Diameter Sequence List and Summary Figure 22 Batch Fixation File pop up menu EYENAL MANUAL 1 INTRODUCTION EYENAL is an off line data analys
22. ce file A start point can be designated by segment lt Segm gt or by time Delay secs gt i Stop Point It is possible to have a Fseq file made with only a portion of the fixation source file A stop point can be designated by segment lt Segm gt or by time lt Duration secs gt Total Segm This box will display the total number of segments contained within the current Fixation file 24 EYENAL MANUAL k Zero Time Origin If this box is checked the time value at the start of the segment processed will be set to 00 00 00 000 This option only effects the output file 5 3 Viewing a Fixation Sequence File Once is selected from the Fixation Sequence Properties menu the Fixation Sequence List will be displayed in the EYENAL program window 5 3 1 Fixation Sequence List Each line of the Fixation Sequence list includes the following information see figure 8 gt gt v v Fixation number Scene Plane Name and number of the area of interest in which the fixation falls If the fixation is on an area not specified as an area of interest it is designated as OFF If overlapping Areas of Interest are defined and a fixation falls within the overlapping areas the Fixation number will be repeated on subsequent lines and all such areas will be listed Fixation start time in hours minutes and seconds 55 555 Fixation Duration in seconds Interfixation length between end of previous fixation and
23. e other data items that can be output for EYEHEAD Integration the below description relates only to a standard EYEHEAD data file Non standard data files can contain raw eye position in the head and 6 columns of head position in addition to the standard data items Consult Technical Support for additional information 1 10 11 Field No A field refers to the data items recorded for a single sampling interval A sampling interval is a 50 60 120 240 of a second depending on the model eye tracker system used A field contains eight pieces of data represented by rows Segment No A segment is a continuous section of recorded data Every time data recording is paused and restarted without closing the data file a new data segment is created on that file so a data file may have one or more segments This column will list the segment of the data file containing the corresponding field row of data Time PC time of day hours minutes seconds at which the field was recorded Total Seconds Same as Time but displayed as the number of seconds since midnight Magnitude Eye to point of gaze distance Scene Indicates which scene plane the subject was looking at during that field H POS Horizontal Eye Position point of gaze on the indicated scene plane V POS Vertical Eye Position point of gaze on the indicated scene plane Pupil Diam Horizontal pupil diameter measure in pixels This measure can be scaled to mm X DAT Exter
24. e time value at the start of the segment processed will be set to 00 00 00 000 This option only effects the output file Pupil scale factor Pupil diameter may be scaled to meaningful units such as millimeters To compute a scale factor for pupil diameter values displayed by or recorded on the Interface program 1 First place the Model Eye at the same eye to camera distance present during experimental conditions 2 Second obtain proper discrimination on the model pupil 3 Third note the pupil diameter value on the interface screen digital display window Pupil Diameter nnn To compute a scale factor divide the recorded value by 3 96 the diameter of the Model Eye pupil Convert displayed or recorded pupil diameter values to millimeters by applying this scale factor value in millimeters scale factor recorded value See the 501 504 Manual section Using the Model Eye for more information gt Compute max fixation duration Checking this box will result in Eyenal computing the longest possible fixation duration The below explanation describes the default or mid range possibility versus Max duration computation Fixation time and lose time are computed by taking the number of data samples that are part of a fixation or loss and multiplying by the update interval For example assuming a 50 Hz system if 10 data samples are found to be part of a fixation the fixation duration is given as 10 20 ms 200 ms 15 EYENA
25. ents 26 eyd File Edi View Fixation AOI Dwell Pupil Batch osle E example eyd aoi file title example aoi Segment 1 soi file names C New Foldertexam B example fix fix file title Segment 1 fix file name C Program Files 4SL example aoi E3 example fsq Seg No Fix No No 0 Sie Segment 1 1 1 0 ADI summary 1 1530 Transition table 1 3 0 Conditional probability 4 4 Joint probability 1 5 1 5 0 1 7 0 1 8 T 3 al 10 1 11 1 12 0 1 13 0 1 14 0 1 15 0 1 15 1 17 EYENAL MANUAL 5 3 3 Fixation Sequence Summary Table The Fseq Summary Table lists the following information To view the Fseq Summary table click AOI Summary on the Fseq file tree E Eyenal example eyd i8 x File Edi View Fixation AO Fseg Dwell Pupil Batch Window Help Dial ale lal l vig El example eyd Segment 1 E example fix Segment 1 example aoi example fsq 2 2 Segment 1 6 485 27 390 25 530 45 000 Banner 0 000 0 000 0 000 0 000 left nav 4 753 20 080 21 280 44 300 text 10 570 44 650 45 740 43 700 Conditional probability logo 1 867 7 890 7 450 42 100 Joint probability Fix Sequence Area of Interest Segment Summary ADI summary Transition table Figure 12 gt Sum Fix Duration time for each AOI This refers to the total time spent fixating a given area of interest during the da
26. fixation but there are known parameters of oculat physiology which allow reasonable criteria to be used Specifically there is research documenting the minimum latency of saccades in response to visual stimuli thus suggesting a minimum fixation duration and data defining the maximum amplitude of involuntary eye movements during the fixation thus establishing maximum fixation boundaties fixation as computed by FIX may be thought of as the mean X and Y eye position coordinates measured over a minimum petiod of time during which the eye does not move more than some maximum amount More simply stated point of gaze must continuously remain within a small area for some minimum time If default values are used maximum change in gaze point is 1 degree visual angle and the minimum time is 100 msec User Adjustable Several parameters used by the algorithm can be set by the user Although default values are specified in this manual it is important that the user examine output from FIX to verify that the program is processing fixations properly Fixation Properties Title Start Stop Criteria 3 2 Making a Fixation File Dutput Fix File 1 To make a Fixation file select the Fixation pull down menu 2 Choose Make a new Fixation file 3 The Fixation Properties window will pop up a Name This is the output file name The default name will be taken from the current EYEDAT file and given a fix extension If desi
27. ft most column of numbers and the topmost row of numbers represent each AOI number In this example there are four areas There were 0 transitions between Area 0 off the scene to Areas 1 2 and 4 There were 8 transitions between Area 0 and Area 3 There were 7 transitions from Area 0 to within area 0 There was 1 transition from Area 1 to Area 3 The highest transitional activity was with in Area 3 5 3 5 Conditional Probability To view the Conditional probability table left click Conditional probability in the Fseq file tree E Eyenal File Edi View Fixation AOI Fseg Dwell Pupil Batch Window Help oem alal gt ew El example eyd Fix Sequence Conditional Probabilities 1 Segment 1 E example fix Segment 1 example aoi E example fsq E Segment 1 ADI summary Transition table Conditional probability Joint probability ADI 0 1 2 3 4 0 467 0 000 0 000 0 533 0 000 0 000 0 000 0 000 1 000 0 000 0 000 0 000 0 000 0 000 0 000 0 292 0 042 0 000 0 667 0 000 0 000 0 000 0 000 0 000 0 000 2 C Figure 14 Definition Conditional probability is the likelihood that given a fixation on one specific area the next fixation will be on another specific area No of fixation transitions from Ai to Aj No of fixations on Ai Reading the Conditional Probability Table This table reads the same way as the transition table except that it is a matrix representing the conditiona
28. h gaze has a standard deviation of no more than a specified amount Criterion 1 Max Count To end the fixation it looks for a specified number of sequential gaze position samples MAX COUNT to be farther than a specified distance Criterion 2 from the initial fixation position Max Blink If the number of consecutive lost data fields pupil diameter 0 in an EYEDAT data sample is less than the defined Max Blink number of fields than the losses are considered a blink A number of consecutive lost fields greater than the maximum are considered losses If a loss occurs during a fixation and is less than the value you set as Max Blink then the loss does not cause the fixation to end If the loss is longer than Max Blink the fixation is considered to have ended with the last field before the loss Vertical 1 2 3 and Eyetracker Units degree This row contains the values in degrees for criteria 1 3 pertaining to the vertical axis The box in the last column is for the number of Eye tracker units that equal 1 degree visual angle in the vertical axis See section 3 2 1 3 for further description Horizontal 1 2 3 and Eyetracker Units degree This row contains the values in degrees for criteria 1 3 pertaining to the horizontal axis The box in the last column is for the number of Eye tracker units that equal 1 degree visual angle in the horizontal axis See section 3 2 1 3 for further description Zeto Time Origin If this box is checked th
29. he viewed scene Files created by EYENAL FIX FIXATION containing lists of eye point of gaze fixations and inter fixation activity Files created by EYENAL FSQ FIX SEQUENCE matching Fixation data files created with FIX to AOI files created by AOI showing how a subject viewed vatious scene elements File created by EYENAL Pupil PUPIL Diameter Analysis program that calculates various Pupil diameter statistics for select portions of EYEDAT data FILE EXTENSION EYD EHD AOI FIX FSQ PDA EYENAL MANUAL Data plotting files created by the PLI EYENAL FIX function to facilitate making plots of fixation position versus time within a statistical program such as EXCEL Files created by CONVERT CONVERT ASC function to convert binaty EYEDAT or EYEHEAD files to an ASCII format suitable for input into other programs such as Excel EYENAL MANUAL 2 View Raw Data Files To View an EYEDAT or EYEHEAD data file 1 select Open from the File Menu 2 Browse to the desired EYEDAT or EYEHEAD file and select Open in the browser window 58249120 2 58249140 58249150 58249180 58249320 58248 340 63988 63988 58243400 58249420 58249440 46 2ooocooooooooooooooooooooooooooooooo Figure 1 Eyedat file EYENAL MANUAL 2 1 Data Columns Once a data file has been opened several columns of data will be shown The
30. ine Areas of Interest AOls 4 1 Purpose and Application The Area of Interest AOT function defines up to 50 Areas of Interest on the visual scene viewed by an Eyetracker subject Areas of Interest are defined as rectangles and may be assigned labels of up to ten characters Once and AOI file exis EYENAL can calculate statistics on time subjects spent viewing various scene elements and the sequence in which they were viewed The AOI function allows the user to create edit draw print and save Area of Interest AOI coordinates on files for future use by EYENAL FSEQ and DWELL functions or possibly other data analysis programs For non EYEHEAD systems the coordinates of each AOI top bottom left and right boundaries can be determined by using the Eyetracker Set Target function see Eyetracker Manual Area of Interest coordinates should be specified to the AOI function in Eyetracker coordinates Scene plane 0 is the Eyetracker calibration plane and is the only plane defined for non EYEHEAD systems EYEHEAD Integration AOI files can be defined for up to twenty scene planes The coordinates for top bottom left and right boundaries of each area in each scene plane are defined in inches or centimeters with respect to the coordinate frame defined on each EYEHEAD scene plane See EYEHEAD manual for explanation of EYEHEAD scene planes Fixplot AOI files can also be made using the Fixplot program Fixplot allows the user to draw Areas of interest
31. is program for processing eye movement and pupil diameter information recorded on EYEDAT and EYEHEAD data files EYENAL identifies eye fixations matches fixations with designated areas of interest on the scene and calculates related scan pattern statistics Subsequent statistical data is saved in Text file formats suitable for further processing with other data analysis or spreadsheet programs Eyenal will also automatically export any of the original ot analyzed data to Excel Eyenal will list all files currently open files on the left side of the program window in a file tree To look at a file ot any selected part of a given file left click on the desired segment and or left click the sign next to a segment number to extend the file tree p Eyenal s21_eyd e xl File Edit View Fixation AO Fseg Dwell Pupil Batch Window Help 81x e E s21 eyd subject id Segment 1 start flag Segment 2 stop flag Segment 3 fix sample 6 Segment 4 Segment 5 Segment 6 1 5 26 20 j i 130 906 126 469 164 219 0 segmenti 2 5 26 21 127 794 130882 163 971 Segment g 3 52622 128 190 134345 165 155 Segment 9 4 5 26 23 122125 136 750 158250 Segment 10 5 5 26 24 T 117294 118 647 166 941 Segment 11 5 26 24 132714 137 048 162 619 Segment 12 7 5 26 24 128 766 137 547 155 265 El s21 fix 8 5 26 25 130167 138 667 158 708 9 5 26 26
32. l probability of transitional activity between Areas of Interest AOTs NOTE Be careful about interpreting conditional probability results If for example there are five areas of interest and out of 200 fixations a given subject looked at area 2 only once followed by a fixation on area 3 then the conditional probability 2 3 1 0 or 100 Obviously this does not mean that there was a lot of visual traffic between areas 2 and 3 but rather that whenever 28 EYENAL MANUAL there was a fixation on area 2 the next fixation was on area 3 In the example cited the result is insignificant because of the small number of fixations on area 2 5 3 6 Joint Probability Table To view the Joint probability table left click Joint probability in the Fseq file tree cx Eyenal example eyd File Edit View Fixation AO Fseg Dwell Pupil Batch Window Help pem le aja s 10 El example eyd Fix Sequence Joint Probabilities 1 Segment 1 E example fix Segment 1 example aoi E example fsq E Segment 1 ADI summary Transition table Conditional probability Joint probability ADI no 0 1 2 3 4 0175 0 000 0 000 0 200 0 000 0 000 0 000 0 000 0 025 0 000 0 000 0 000 0 000 0 000 0 000 0175 0 025 0 000 0 400 0 000 0 000 0 000 0 000 0 000 0 000 4 C0 Figure 15 Definition Joint probability is the relative likelihood or relative frequency of a transition between two particular areas as compared to transitions
33. m a dwell period in Area i to a new dwell period in Area j 0 499 0 000 0 679 1 761 0 373 Sigma Median Dwl 0 583 0 000 0 375 1 423 0 206 0 267 0 000 0 450 1 508 0 333 Skew 0 232 0 000 0 229 0 253 0 040 view the Dwell Transition Table left click on Transition table in the Dwell file tree Reading the Transition Table GO TO Section 5 3 4 Reading the Transition Table and Figure 11 for a sample transition table 32 EYENAL MANUAL 6 4 1 Dwell Conditional Probability Table Definition Conditional probability is the likelihood that given a dwell on one specific area the next dwell will be on another specific area No of dwell transitions from Ai to Aj No of dwells on Ai Reading the Conditional Probability Table This table reads the same way as the transition table except that it is a matrix representing the conditional probability of transitional activity between Areas of Interest AOT s GO TO section 5 3 4 for information on reading a transition table 6 4 2 Dwell Joint Probability Table Definition Joint probability is the relative likelihood or relative frequency of a transition between two particular areas as compared to transitions between other pairs of areas No of fixation or dwell transitions from Ai to Aj Pjj Total numbet of transition pairs Reading the Joint Probability Table This table reads the same way as the transitio
34. n table except that it is a matrix representing the joint probability of transitional activity between Areas of Interest AOT s GO TO section 5 3 4 for information on reading a Transition table 6 4 3 Dwell Histogram The Dwell funcion wil produce histogram data for each Area of Be tiation AOI Fsea Dwell Pupi Batch Window Help Interest included in the file List Ee ae viel example eyd Dwell Histogram 1 Segment 1 example fix Segment 1 example aoi j example fsq E Segment 1 example dwl E Segment 1 ADI summary Transition table Conditional probability Joint probability Histogram 2 Histogram 3 Histogram 4 Area of Interest 0 Min Dwell Value Fields 9 000000 Interval No Dwell Frequency DO mons wn o a 2 2 2 AA p Figure 19 33 EYENAL MANUAL 7 Pupil Statistics 7 1 Purpose and Application The Pupil Function will compute various statistics based on pupil diameter for specified amounts of time on a data file The pupil data output is comprised of a sequential list of pupil diameters for each data field pupil average pupil median pupil variance standard deviation and blink frequency 7 2 Making a Pupil pdf file 1 Select Make new pupil diameter analysis fle from the Pupil pulldown menu A Property Page 2 Once the Properties window pops Eyedat File ERP EMESIS E up review the listed p
35. nal Data this column will show the value that was on the eye tracker parallel external data XD AT port during the data field Mark This column will show any manual event marks entered into the data file by the operator from the e5win program These matks can be 0 9 10 EYENAL MANUAL pe Eyenal piano1_ehd 0 0 0 0 0 m oO 0 0 0 0 o 0 0 0 0 0 333 8 2 0 11 3625850 41785 850 0 0 11 3625867 41785 B 35 0 36 2 0 34 0 0 36 0 a 34 0 0 34 0 0 3 U 1 i0 42 0 1 0 4 0 4 m0 zl 42 0 3 i 43 0 0 4 0 0 42 0 0 4 0 411 2 4 0 41781170 41 0 41786 133 5 0 0 E 2 0 2 0 0 3 E 0 g i 3 41786 233 0 0 Figure 2 Eyehead data file 11 EYENAL MANUAL 3 Calculate Fixations 3 1 Purpose and Application The FIX function reduces raw eye position data on an EYEDAT or EYEHEEAD file to a series of fixation points and recorded on another file The term fixation refers to a person s point of regard as one looks at a stationary target in a visual field Fixations are distinguished primarily from saccades rapid voluntary eye movements used to move from one fixation point to another and very small involuntary eye movements of several types which occur during fixation There is currently no precise universally accepted definition of a
36. nits degree N A for EYEHEAD data files Eyedat files e g data gathered with the model 504 pan tilt optics do not contain the information about subject to scene distance or scene camera position and magnification that is required to express the point of gaze data in terms of visual angles degrees of eye ball rotation The program must be EYEHEAD Integration data data gathered with head mounted optics a magnetic head tracker ASL s EYEHEAD Integration software contains enough information for the program to compute visual angles 17 EYENAL MANUAL told how many eye tracker data units correspond to a degree of visual angle This ratio eye tracker units per degree visual angle must be determined for both the horizontal and vertical axis and is entered under a label named Eye tracker Units degree The following subsection explains how this parameter can be determined 3 2 3 Visual Angle Computation The following is a suggested procedure for determining eye tracker units per degree of visual angle Please note that this computation is not necessary for EYEHEAD data In addition there is a Visual Angle Calculator application that can perform this operation The Visual Angle calculator application is available for download on ftp a s l com pub Visual Angle Calculator 1 Measure the distance in inches or centimeters from the subject eye to the center of the scene plane Call this s Measure the
37. ntal Eye Position 6 V POS Vertical Eye Position 7 Pupil Diam Horizontal pupil diameter measure in pixels This measure can be scaled to mm 8 X DAT External Data this column will show the value that was on the eye tracker parallel external data XD port during the data field 9 Mark This column will show manual event marks entered into the data file by the operator from the e5win program These matks can be 0 9 If using a model 504 Pan Tilt with Magnetic Head Tracker option an additional six columns of MHT data will also be displayed 10 MHT X Sensor location in the transmitter X axis 11 MHT Y Sensor location in the transmitter Y axis 12 MHT Z Sensor location in the transmitter Z axis 13 AZIMUTH Sensor orientation 14 ELEVATION Sensor orientation EYENAL MANUAL 15 ROLL Sensot orientation 2 1 2 EYEHEAD Data Files An EYEHEAD data file recorded with head mounted optics and ASL s EYEHEAD Integration feature has an ehd extension A Standard EYEHEAD data file will contain 11 columns of data EYEHEAD data includes the computed intersection for line of gaze on one to twenty individual surfaces scenes subject eye to scene distance and pupil diameter The intersection is defined in specified units inches or cm All files have a segment maximum of 169 Note segments exceeding approximately 5 min may be divided into pseudo segments which count toward the segment maximum See figure 2 NOTE there ar
38. on on Marks and X DAT refer to the ASL Model 501 504 user manual h Use stop flag Mark or X DAT values may be used as flags to trigger the end of fixation calculations Check this box to use a stop flag then specify the appropriate flag in one of the two 34 EYENAL MANUAL j boxes to the right NOTE For more information on Marks and X DAT refer to the ASL Model 501 504 user manual Zero Time Origin If this box is checked the time value at the start of the segment processed will be set to 00 00 00 000 This option only effects the output file Pupil Scale factor Pupil scale factor Pupil diameter may be scaled to meaningful units such as millimeters To compute a scale factor for pupil diameter values displayed by or recorded on the Interface program 4 First place the Model Eye at the same eye to camera distance present during experimental conditions 5 Second obtain proper discrimination on the model pupil 6 Third note the pupil diameter value on the interface screen digital display window Pupil Diameter nnn To compute a scale factor divide the recorded value by 3 96 the diameter of the Model Eye pupil Convert displayed or recorded pupil diameter values to millimeters by applying this scale factor value in millimeters scale factor recorded value See the 501 504 Manual section Using the Model Eye for more information Blink Fields If the number of consecutive lost data fields pupil diameter 0 in an EY
39. rdinate H Bottom enter Bottom coordinate 4 Select the New button to store the current Area and create another one on the same file Repeat steps C H OR Select to save and create an AOI file based on the information entered into the AOI properties menu Example AOI file SZLLMc o ee 5 zBIXI E Fi EYEHEAD Y Eyenal Eyenal5 nonEYEHEAD figure 8 22 EYENAL MANUAL 4 3 Editing an AOI file To edit an AOI file 1 Select the AOI pull down Menu 2 Choose Open and open desired AOI file 3 Once the desired file is open select Edit from the AOI pull down menu This will bring up the Area of Interest Properties menu allowing you to edit any of the coordinates titles or plane designations plus add a new area or delete an old one Use the arrows to the right of the AOI N atea of interest number box to select an area contained in the file 4 When finished click OK to save the changes It may be necessary to refresh the screen to view the changes outside the Area of Interest Properties window 23 EYENAL MANUAL 5 Fixation Sequence Analysis FSEQ 5 1 Purpose and Application The FSEQ function is used to study the amount of time subjects spent viewing various scene elements and the sequence in which they were viewed FSEQ matches fixation point data from files
40. red rename the output file b Code Information typed here shows up in the file header c Title Information typed here Cancel shows up in the file header Figure 3 12 EYENAL MANUAL 4 Click Start Stop tab and set Start and Stop properties 5 Click the Criteria tab and set properties 6 Click OR 3 2 1 Start Stop Criteria The Start Stop Criteria menu allows the user to specify a particular duration of the of the raw data for analysis Start Point A Fseq file can be made with only a portion of the fixation source file A start point can be designated by segment lt Segm gt or by time Delay secs Stop Point It is possible to have a Fseq file made with only a portion of the fixation source file A stop point can be designated by segment lt Segm gt or by time Duration secs gt Flags a Use start flag Mark or X DAT values may be used as flags to trigger the beginning of fixation calculations Check this box to use a start flag then specify the appropriate flag in one of the two boxes to the right NOTE For more information on Marks and X DAT refer to the ASL Model 501 504 user manual b Use stop flag Mark or X DAT values may be used as flags to trigger the end of fixation calculations Check this box to use a stop flag then specify the appropriate flag in one of the two boxes to the right NOTE For more information on Marks and X DAT refer to the ASL Model 501 504 user manual
41. roperties PDA File C Program Files ASL Eyenal examplepda 0 2 leet a Eyedat File this is the soutce file Segments b PDA File this will be the output file StatSeg 1 f Tea 1 Stepses 1 name If desired change the output Start delay 0 Duration 9999 file name or keep the default name secs Flags Use start flag an C Value p c Label Information typed here Use stop Mak C ZOA Value shows up in the file header Zero Time Origin Pupil scale factor E 2 Blink Fields d Code Information typed here Minimum Maximum 12 shows up in the file header e Segments A PDA file can be made Hee i figure 20 with only a portion of the source file if the source file has 1 segments A start and stop point can also be designated by Eyedat file segment f Start Delay It is also possible to delay the analysis start point in seconds When using a start delay one can also specify a Duration of the file seconds to be analyzed e g If a file was 10 minutes long a start delay of 60 seconds and a duration of 60 seconds would yield information from minute 2 of that file g Use start flag Mark or X DAT values may be used as flags to trigger the beginning of fixation calculations Check this box to use a start flag then specify the appropriate flag in one of the two boxes to the right NOTE For more informati
42. s any scene plane into a grid space of 260 by 240 thus all gaze coordinates reported beyond 0 0 and 260 240 are theoretically outside the plane of interest Default values ate 0 70 Jeff 10 right 270 and bottom 270 because it is possible for the system to make valid gaze measurements just beyond the boundary limits and taking into account the systems accuracy 16 EYENAL MANUAL 3 2 2 3 Fixation Algorithm Criteria Description Criteria 1 2 and 3 are defined in terms of visual angle eyeball rotation angle These criteria are user adjustable For small visual angles in the center of the scene d s tan x e where d is the distance on the scene S is the subject s eye to scene distance e X is the visual angle Thus if the subject is seated 57 3 inches from the scene a square covering 1 degree visual angle would measure 1 inch by 1 inch Fixation Algorithm Criteria Degrees Eve Tracker 2 Units degree Vertical fo 5 fi fi 5 o Horizontal o 5 E o Fixation Properties x General Criteria Min sample 6 count Max blink fi 2 Flags Use start flag Mark start flag 0 XDAT start Use stop flag Mark stop flag o DAT stop Jo Fixation Algorithm Criteria 4 Degrees Eye Tracker 1 2 3 Units degree 5 Mi hs Horizontal 05 fis Zero Time Origin Pupil scale factor fi H Cea i Figure 6 Eye Tracker U
43. ta segment Dwell time for each area of interest is listed both in seconds and as a percent of total fixation time during the data segment gt Sum Fix Cnt Total Number of fixations on each area Fix Cnt Percent of fixations in each area number of fixations a given area divided by the total number of fixations Mean Fix Dur The mean duration in seconds of fixations on each area Dwell time divided by number of fixations Mean Interfix Dur Mean interfixation length in seconds while subject was fixating in each AOI Mean Inter Fix Dist Mean interfixation distance in degrees while subject was fixating in each AOI Mean PD Mean pupil diameter for each AOI while subject was fixating on each AOI 5 3 4 Transition Table To view the Transition table left click on Ele Edt Fixation AOI Fseg Dwell Pupil Batch window Help Transition table in the Fseq file tree El example eyd Segment 1 example fix Segment 1 example aoi E example fsq E Segment 1 ADI summary Transition table Conditional probability Joint probability figure 13 27 EYENAL MANUAL Description The Transition Table is a matrix representing the actual amount of transitional activity between Areas of Interest AOT s A transition from i to j is the change from a fixation in Area i to a new fixation in Area j Reading the Transition Table Referring to the sample table above figure 12 the le
44. the data segment gt Total loss time during the data segment Loss time refers to time during which the pupil was not recognized by the Eyetracker This includes some blink time gt Mean interfixation distance This distance is the average length between fixations in degrees of visual angle and was calculated using the Eyetracker Units deg value as lt x Eyenal example eyd 3 Eie Edit View Fixation AOI Fseg Dwell Pupil Batch Window Help amp x eel E example eyd Segment 1 E example fix Segment 1 example E example fsq H Segment 1 For Help press F1 Figure 11 alaj eL viel aoi file title file names C Wew Folder example fix file title fix file names C New Foldertexample fix 15 44 46 15 44 46 15 44 47 15 44 48 15 44 48 15 44 48 left nav 15 44 48 off 15 44 49 off 15 44 49 text 15 44 49 text 15 44 49 text i text oooooooooooooooooro segment start time 15 44 46 667 segment end times 15 45 15 933 segment duration timez 00 00 29 267 number _of_fixations 94 mean_duretion 0 251862 segment loss seconds 0 000000 mean InterFix degrees 5 387957 fixation frequency 3 211260 specified in the fixation program or computed by the program from information in EYEHEAD files Navigation Left click on the sign to extend the Fseq file tree Left click on any of the subsequent files to view cont
45. tracker units dv Vertical distance from calibration point 2 to point 5 7 inches Etv number of vertical Eyetracker units between points 2 and 5 105 eyetracker units O point 2 dv 0v Eye lt Q O point 5 Sample Calculations Oh tan dh s 15 9 deg Horizontal eyetracker units per degree 120 15 9 7 5 Ov tan dv s 14 deg Vertical eyetracker units per degree 105 14 7 5 3 2 5 Detailed Fixation Determination Algorithm A three boundary approach is used to define fixations The recommended values for the three boundaries called criterion 1 2 and 3 are 0 5 degrees 1 0 degree and 1 5 degrees respectively These values may be reset as described in Section 3 2 2 The program uses a moving window technique to find the fixation start point The first min sample data samples are examined Min sample is adjustable as described in Section 8 4 1 but it is usually set to the number of fields that will correspond to about 100 msec If the standard deviations of the X horizontal and Y vertical eye position coordinates is less than criterion 1 the means of this sample are used as temporary fixation coordinates XT YT If the standard deviation was greater than criterion 1 then the min sample window is moved up one field and the calculations repeated until a min sample window which passes criterion 1 is found Once a fixation start point is determined the program calculates the horizontal and vertic
46. ult values will be interpreted as not valid data even though pupil diameter is not zero and the data will not be incorrectly interpreted as fixations at these positions If analyzing data from a remote eye tracker it usually makes sense to enable Detect CR Loss by checking this box If analyzing data from a system with head mounted optics it is usually best to disable this feature by leaving this box unchecked gt Scene Boundary Limits N A with EYEHEAD data files ehd If this feature is enabled and if the eye point of gaze position is outside of the defined scene boundary limits this is treated as not valid data This provides a means of filtering out ridiculous data values that may occur for example if some extraneous reflection is recognized as the pupil or CR It makes most sense to use this feature when analyzing data from a remote eye tracker which we know can make valid measurements only when the subject looks within about 25 degrees visual angle of the optics module If for example the subject was looking at a computer monitor scene data values that would indicate gaze points many feet from the scene are unlikely to be valid data and can be filtered out Set boundary limits that define a region within which it is reasonable to expect valid gaze data Check the box to enable the scene boundary limit feature then type in the top bottom left and right coordinates of the scene boundaries The ASL system divide

Instruction manual, model 4000SU FMOspl

Contents

Download Pdf Manuals

Related Search

Related Contents