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Sgttoolbox: Utility for controlling SimpleGazeTracker from Psychtoolbox.

Hiroyuki Sogo1

  • 1Faculty of Law and Letters, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan. hsogo@ehime-u.ac.jp.

Behavior Research Methods
|August 10, 2016
PubMed
Summary

This study introduces Sgttoolbox, a new Matlab/Octave toolbox for synchronizing visual stimulus presentation with eye movement recording. Sgttoolbox facilitates eye-tracking studies using the open-source SimpleGazeTracker and Psychtoolbox.

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Area of Science:

  • Cognitive Science
  • Neuroscience
  • Computer Science

Background:

  • Eye movement analysis is crucial for understanding visual perception and cognition.
  • Decreasing costs of eye trackers enable wider research accessibility.
  • Synchronizing stimulus presentation with eye tracking remains a challenge, especially without a practical API.

Purpose of the Study:

  • Introduce Sgttoolbox, a Matlab/Octave toolbox designed to simplify the synchronization of visual stimulus presentation and eye movement recording.
  • Facilitate the use of the open-source SimpleGazeTracker with the widely-used Psychtoolbox experiment control library.

Main Methods:

  • Developed Sgttoolbox, a software toolbox integrating with Psychtoolbox.
  • Utilized SimpleGazeTracker, an open-source eye-tracking application.
Keywords:
Eye trackingOpen sourcePerformance testPsychtoolbox

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  • Evaluated temporal accuracy and data transfer latency between the eye tracker and stimulus presentation software.

    • Main Results:

    • Sgttoolbox enables synchronization between SimpleGazeTracker and Psychtoolbox.
    • Stable eye movement sampling frequency was achieved when stimulus presentation and recording occurred on a single PC.
    • Separating presentation and recording onto different PCs yielded better performance.
    • A minor average transfer delay of 2-4 ms was observed for eye position data.

    Conclusions:

    • Sgttoolbox offers a viable solution for researchers using Psychtoolbox who need to integrate eye-tracking data.
    • The toolbox is particularly suitable for studies where the observed 2-4 ms transfer delay does not significantly impact experimental outcomes.
    • This facilitates more accessible and potentially cost-effective eye-tracking research.