Eye Movement Analysis Software

ILAB© is a collection of Matlab® functions for analyzing eye movement data generated by the ASL®, CORTEX®, ISCAN®, or IVIEW® systems. It was written to interpret our eye movement data at the Cognitive Neurology and Alzheimer's Disease Center at Northwestern University.

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The current version of ILAB is 3.6.0 released on October 2,, 2004.

FEATURES

• New features recently added include display of pupil size data, filtering, many bug fixes, device independent coordinate system, and export of eye movement or pupil data for use as a covariate in MRI analyses.
• read ASL® ("eyedat"), ISCAN® ("binary"), IVIEW®, and CORTEX® eye data files
  • allow user to define specific trials and edit imported data to resolve errors in trial designation
  • editing can be done by removing or adding single flags
  • the trials indices can be exported and edited in a spreadsheet program then reimported
  • the trial indices can be edited "automatically" by specifying durations of trials or relationships to the preceding or following trials
  • converted data are saved in a common easy to load format
  • the data format includes information about screen size and analysis parameters in order to keep this information with the data.
• Display of eye position data
• Dynamic image management to display over images the subject was viewing
• Timed display, plots eye position in different colors as a function of time.
• Left-right display, plots eye position in green or red as a function of left-right movement
• User defined speed of display, size of display, and mapping to original display of stimuli
• Display of horizontal and vertical eye velocity data
• recognizing trials delineated in time by user defined flags
  • works with ASL xdat and mark flags and ISCAN serial flags
  • also recognizes separate flags for "targets"
  • user can select one, several or all trials easily
• User defined regions of interest (ROIs) that can be saved
• Correlating eye position with specific ROI
• Monitoring gaze maintenance within an ROI
• Analysis and plotting of fixations using dispersion or velocity algorithms
• Analysis of saccades
  • allows user to modify saccade selection and/or add saccades
  • allows user to alter parameters defining saccade selection
• Blinks can be filtered from data
• Filtering of data using easily implemented digital filters.

CITATION
When using ILAB in your research please include the following citation:
Gitelman D.R. (2002) ILAB: a program for postesperimental eye movement analysis. Behavioral Research Methods, Instruments and Computers, 34(4): 605-612.

HISTORY
The original version was written in 1995-1996 by Darren Gitelman who has also debugged and supervised the project over the years. John Bernero contributed additional functions in 1998, and in 2000 Roger Ray updated the program. The impetus for the program was the lack of available software for easily analyzing and displaying eye movement data. It is distributed freely to the scientific community to promote collaboration, and because the generosity of others has helped our lab over the years.

Disclaimer / Copyright

Rev: October 3, 2004