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Microsaccades during high speed continuous visual search.

Jacob G Martin1, Charles E Davis1, Maximilian Riesenhuber2

  • 1CNRS Center for Brain and Cognition Research (CerCo), Toulouse, France.

Journal of Eye Movement Research
|April 8, 2021
PubMed
Summary
This summary is machine-generated.

During visual search, microsaccades (tiny, rapid eye movements) nearly cease upon stimulus presentation, indicating efficient visual processing. Task-oriented microsaccades can occur post-saccade to aid visual search goals.

Keywords:
continuous visual searcheye trackingfixationsmicrosaccadesoculomotorsaccades

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Background:

  • Microsaccades are small, rapid eye movements crucial for visual processing.
  • Understanding their role in continuous visual search is essential for explaining visual perception efficiency.

Purpose of the Study:

  • To analyze microsaccade behavior during continuous visual search and targeting of faces.
  • To investigate the influence of background complexity and target eccentricity on microsaccade activity.
  • To determine if microsaccades serve perceptual functions during visual search tasks.

Main Methods:

  • Participants performed continuous visual search for upright or inverted faces in cluttered or simple backgrounds.
  • Eye movements, including microsaccades and saccades, were recorded as participants targeted faces.
  • Microsaccade rates and distributions were analyzed in relation to stimulus onset and saccade offsets.

Main Results:

  • Microsaccade rate dropped to near zero within 12 ms of stimulus onset, irrespective of background or target eccentricity.
  • Microsaccades were rarely observed between stimulus onset and the first saccade to the target.
  • Approximately 20% of trials featured a single post-saccadic microsaccade, task-oriented towards facial landmarks.

Conclusions:

  • A single feedforward pass through the visual hierarchy may suffice for prolonged continuous visual search.
  • Microsaccades can fulfill perceptual roles, such as saccade correction or achieving task-oriented goals in continuous visual search.