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The art of braking: Post saccadic oscillations in the eye tracker signal decrease with increasing saccade size.

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  • 1Experimental Psychology, Helmholtz Institute, Utrecht University, Heidelberglaan 1, 3584 CS Utrecht, The Netherlands.

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Summary
This summary is machine-generated.

Post saccadic oscillations (PSOs) in video eye tracking signals are idiosyncratic and vary with saccade size. Understanding these pupil signal variations is crucial for comparing eye tracking data across different technologies.

Keywords:
Eye trackingPost-saccadic oscillationSaccade

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Computer Vision

Background:

  • Video-based eye trackers capture post saccadic oscillations (PSOs), pupil movements relative to the limbus.
  • Understanding these signals is vital for comparing modern eye tracking data with older technologies like coils and Dual Purkinje Image (DPI).

Purpose of the Study:

  • To investigate post saccadic oscillations (PSOs) in horizontal and vertical saccades using high-quality video eye trackers.
  • To determine the relationship between PSO characteristics and saccade size and direction.

Main Methods:

  • Two high-quality video eye trackers were used to record PSOs during horizontal and vertical saccades of varying sizes.
  • Analysis focused on PSO amplitude and its correlation with saccade parameters.

Main Results:

  • PSOs exhibited high similarity within individual observers but varied significantly between observers.
  • PSO amplitude decreased with increasing saccade size, a more pronounced effect in vertical saccades.
  • PSOs were nearly absent in large vertical saccades, suggesting a link to saccade deceleration.

Conclusions:

  • Post saccadic oscillations (PSOs) are idiosyncratic and dependent on saccade size, potentially related to saccade deceleration.
  • These characteristics pose challenges for automated saccade detection algorithms.
  • Standardized reporting of eye tracker specifics and data extraction methods is essential for cross-study comparability.