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Monocular microsaccades: Do they really occur?

Yu Fang1, Christopher Gill1, Martina Poletti2,3

  • 1Department of Psychological & Brain Sciences, Boston University, Boston, MA, USA.

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|April 21, 2018
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Summary
This summary is machine-generated.

Monocular microsaccades are rare during fixation. This study found that small saccades, or microsaccades, are almost always binocular events, challenging recent claims of frequent monocular occurrences.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vision Science

Background:

  • Microsaccades are small, frequent eye movements during fixation.
  • Recent studies suggest a significant portion of microsaccades are monocular.
  • Older reports indicate microsaccades are typically binocular events.

Purpose of the Study:

  • To investigate the binocularity of microsaccades using high-resolution eye-tracking.
  • To determine if monocular microsaccades occur during head-fixed and head-free fixation.

Main Methods:

  • Utilized a binocular Dual Purkinje Image eye-tracker for head-fixed recordings.
  • Employed a head-coil system for head-free eye movement measurements.
  • Analyzed eye movement data from observers fixating on visual markers.

Main Results:

  • Monocular microsaccades were virtually absent in both head-fixed and head-free datasets.
  • Not a single monocular microsaccade was observed in head-fixed conditions.
  • Only one potential monocular event was found among over a thousand saccades in head-free viewing.

Conclusions:

  • Monocular microsaccades are not a common occurrence during fixation.
  • Findings support the view that microsaccades are predominantly binocular.
  • The study challenges recent claims of frequent monocular microsaccades.