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Data Files
©
2013-2017 SR Research Ltd.
Keyword
Effect
LEFT, RIGHT
Sets the intended tracking eye (usually include both LEFT and
RIGHT)
FIXATION
includes fixation start and end events
FIXUPDATE
includes fixation (pursuit) state update events
SACCADE
includes saccade start and end events
BLINK
includes blink start and end events
MESSAGE
includes messages (ALWAYS use)
BUTTON
includes button 1..8 press or release events
INPUT
includes changes in input port lines
These examples of the command are the default event configuration:
file_event_filter= LEFT,RIGHT,FIXATION,SACCADE,BLINK,MESSAGE,BUTTON
4.7 EDF File Utilities
A number of utility programs are included in the EyeLink 1000 Plus package, to
process and view EDF files. The utility EDF2ASC translates EDF files into text
ASC files for processing with user applications. EyeLink Data Viewer is an
optional tool that allows displaying, filtering, and reporting the output of
EyeLink Data Files. Please check EyeLink Data Viewer User’s Manual for
details.
4.8 Using ASC Files
The EDF file format is an efficient storage format for eye movement data, but is
relatively complex to support. To make the data in EDF files accessible, the
translator EDF2ASC converts the files into a text version that is easily
accessible from almost any programming language. The converted ASC files
contain lines of text, with each line containing data for a single sample, event or
data parameter.
The EDF2ASC utility reads one or more EDF files, creating text files with the
same name but with the ASC extension. It scans the input file, reordering data
as required, and converting samples and events into lines of text. It can also
compute resolutions and instantaneous velocity for sample data. An ASC file
will generally be about twice as large as the original EDF file.
EDF2ASC converter utility can be run from the GUI interface (from your
computer desktop, click “Start -> Programs -> SR Research -> EyeLink ->
Utilities -> Visual EDF2ASC” assuming that you have installed the EyeLink
Data Viewer software). The user can also run the EDF2ASC converter from the
DOS command line prompt, assuming that Windows Display Software has been
installed. To translate an EDF file from the command line prompt, type
