SR Research EyeLink Portable Duo User Manual page 6

3.7 Calibration .......................................................................................... 56
3.8 Validation ........................................................................................... 60
3.9 Improving Calibration Quality ............................................................. 61
3.10 Recording Gaze Position .................................................................... 63
3.11 Drift Checking and Drift Correction ................................................... 63
3.11.1 Enabling Drift Correction ............................................................................. 64
3.11.2 Online Drift Correction ................................................................................. 64
3.12 Exiting the Host Application .............................................................. 66
3.13 EyeLink Portable Duo Setup Summary .............................................. 66
3.14 Experiment Practice .......................................................................... 67
3.15 Next Steps: Other Sample Experiments ............................................. 67
4 Data Files .................................................................................................................. 71
4.1 File Contents ...................................................................................... 71
4.2 Recording EDF Files ............................................................................ 72
4.2.1 Recording from the EyeLink Portable Duo Host PC ..................................... 72
4.2.2 Recording from the EyeLink API or SR Research Experiment Builder ......... 72
4.3 The EyeLink On-Line Parser ................................................................ 72
4.3.1 Parser Operation ........................................................................................... 72
4.3.2 Parser Limitations ......................................................................................... 73
4.3.3 EyeLink Parser Configuration ....................................................................... 73
4.3.4 Parser Data Type .......................................................................................... 74
4.3.5 Saccadic Thresholds ..................................................................................... 74
4.3.6 Pursuit Thresholds ........................................................................................ 75
4.3.7 Fixation Updates ........................................................................................... 75
4.3.8 Other Parameters .......................................................................................... 76
4.3.9 Sample Configurations .................................................................................. 76
4.4 File Data Types ................................................................................... 77
4.4.1 Samples ........................................................................................................ 77
4.4.2 Position Data ................................................................................................. 78
4.4.3 Pupil Size Data .............................................................................................. 80
4.4.4 Button Data ................................................................................................... 81
4.5 Events ................................................................................................ 81
4.5.1 Messages ...................................................................................................... 81
4.5.2 Buttons .......................................................................................................... 82
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