User manual

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Saccade extension. This is intended to allow the saccade period to include

the lower-velocity start and end of the saccadic period. This is usually

disabled, as its effect is minor.

• Internal constants. These MUST NOT be changed.

4.3.9 Sample Configurations

The complete set of commands for the most useful tracker configurations is

given below. The cognitive configuration is conservative, is less sensitive to

noise and ignores most saccades smaller than 0.6°. The psychophysical

configuration is useful for neurological and smooth-pursuit research, and

reports very small saccades. It also better estimates saccade durations and

average velocities.

Cognitive Configuration:

recording_parse_type = GAZE

saccade_velocity_threshold = 30

saccade_acceleration_threshold = 8000

saccade_motion_threshold = 0.15

saccade_pursuit_fixup = 60

fixation_update_interval = 0

Psychophysical configuration:

recording_parse_type = GAZE

saccade_velocity_threshold = 22

saccade_acceleration_threshold = 4000

saccade_motion_threshold = 0.0

saccade_pursuit_fixup = 60

fixation_update_interval = 0

4.3.10 Reparsing EyeLink Data Files

The Host PC parses data in real time in order to make eye events immediately

available to the Display PC. These events are recorded in the EDF file for later

access by the DataViewer. The parameters used during the initial parsing are

supplied in the REMPARSE.INI for the EyeLink Remote and in PARSER.INI for

all other modes of recording.

Occasionally, researchers wish to evaluate the data using different parametric

definitions. The EyeLink 1000 Host PC software (Version 4.0 or later) supports

reparsing existing EyeLink 1000 EDF files. To do this, save the desired saccade