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Related Experiment Video

Updated: Aug 4, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

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Cognitive influences on fixational eye movements.

Yen-Chu Lin1, Janis Intoy2, Ashley M Clark2

  • 1Feil Family Brain and Mind Research Institute, Weill Cornell Medical College, 1300 York Avenue, New York, NY 10065, USA.

Current Biology : CB
|April 4, 2023
PubMed
Summary
This summary is machine-generated.

Cognitive processes influence eye movements even during fixation. This study reveals that cognitive control directs ocular drifts, a type of fixational eye movement, independent of visual input.

Keywords:
active visionfoveal visionocular driftsoculomotor control

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Background:

  • Oculomotor control is crucial for visual perception and linked to cognitive processes.
  • While cognitive influences on large eye movements (saccades, smooth pursuit) are known, control over fixational eye movements like ocular drifts is less understood.
  • Ocular drifts, though seemingly random, are neurally controlled and may enhance spatial detail processing.

Purpose of the Study:

  • To investigate the cognitive control of ocular drifts.
  • To determine if cognitive factors influence drift direction independently of visual stimuli (open-loop control).

Main Methods:

  • A letter discrimination task was employed.
  • Subjects performed the task while viewing pure noise fields, isolating open-loop cognitive influences.
  • Ocular drift direction was analyzed during this task.

Main Results:

  • Ocular drifts are subject to cognitive control.
  • This control operates in an open-loop manner, meaning it's driven by task knowledge rather than immediate visual feedback.

Conclusions:

  • Cognitive processes exert top-down control over fixational eye movements, specifically ocular drifts.
  • Understanding this open-loop control mechanism provides new insights into the neural basis of visual perception and oculomotor behavior.