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Closed loop motor-sensory dynamics in human vision.

Liron Zipora Gruber1, Ehud Ahissar1

  • 1Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel.

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Summary
This summary is machine-generated.

Eye drifts, previously thought to be independent of visual input, are actually part of a closed-loop process. This finding suggests that vision itself is an inherently closed-loop system, influenced by continuous visual feedback.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • Continuous eye motion is crucial for vision, comprising saccades and drifts.
  • Saccades are fast eye movements, while drifts are slow scanning movements.
  • Drifts were traditionally assumed to operate independently of visual input (open-loop).

Purpose of the Study:

  • To investigate whether eye drift kinematics are influenced by concurrent visual input.
  • To challenge the prevailing assumption of drifts functioning in an open-loop manner.
  • To determine if vision is an inherently closed-loop process.

Main Methods:

  • Utilized a real-time gaze-contingent display to manipulate visual input.
  • Analyzed the kinematic properties of eye drifts under controlled visual conditions.
  • Tested the dependency of drift trajectory and speed on visual stimuli.

Main Results:

  • Drift trajectory was found to be dependent on concurrent visual input.
  • Drift speed converged to condition-specific values.
  • Evidence suggests the maintenance of controlled variables related to drift motor-sensory feedback.

Conclusions:

  • Eye drifts are integrated into a closed-loop brain-world process, influenced by visual input.
  • The findings challenge the traditional view of drifts as open-loop.
  • Vision is proposed to be an inherently closed-loop system, not merely a sequence of open-loop snapshots.