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A discontinuity in motion perception during fixational drift.

Josephine C D'Angelo1,2, Pavan Tiruveedhula1,3, Raymond J Weber4,5

  • 1Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley, Berkeley, CA, USA.

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Summary
This summary is machine-generated.

The human visual system perceives motion differently during eye drift. Stimuli aligned with retinal slip appear stable, while those opposing it seem to move, especially with distant backgrounds.

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Area of Science:

  • Neuroscience
  • Vision Science
  • Perception

Background:

  • The human visual system normally maintains stable perception despite constant eye movements.
  • However, during fixational drift, visual stimuli moving with retinal slip can become imperceptible, even when amplified.
  • This phenomenon raises questions about the mechanisms underlying motion perception during naturalistic eye movements.

Purpose of the Study:

  • To investigate whether stimuli moving with retinal slip, even at reduced magnitudes, are perceived as stable.
  • To explore the influence of background context on motion perception during eye drift.

Main Methods:

  • Utilized an adaptive optics scanning light ophthalmoscope to present stimuli.
  • Stimuli movement was contingent to measured retinal motion.
  • Subjects reported perceived motion under varying background conditions (world-fixed, near, and far).

Main Results:

  • A distinct threshold in motion perception was observed.
  • Stimuli moving in the direction of retinal slip were perceived as having little to no motion, regardless of magnitude.
  • Stimuli moving opposite to eye motion were perceived as moving.
  • This effect was significantly reduced when background content was displaced beyond 4°.

Conclusions:

  • Motion perception during fixational drift is highly sensitive to the relationship between stimulus motion and retinal slip.
  • The perceived stability of an object is influenced by its motion relative to the retina and the presence of contextual background elements.
  • Spatial separation of background elements plays a critical role in modulating this visual phenomenon.