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A circuit model for transsaccadic space updating and mislocalization.

Xiao Wang1, Sophia Tsien2, Michael E Goldberg3,4

  • 1Chengdu Fluid Dynamics Innovation Center, Chengdu, Sichuan, China.

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|November 18, 2024
PubMed
Summary

The brain uses a circuit model to explain how visual stimuli are remapped across saccades (eye movements). This model accounts for perceptual stability and mislocalization errors during rapid eye movements.

Keywords:
aware and unaware decodersdouble-step saccadeefference copyfrontal eye fieldslateral intraparietal areamemory mislocalizationperceptual continuitypredictive remappingvisuomotor integration

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Cognitive Science

Background:

  • Perception of a stable visual world persists despite dynamic retinal image changes during saccades.
  • While persistent objects appear stable, flashed stimuli around saccades can be mislocalized, posing a puzzle for visual processing.

Purpose of the Study:

  • To present and validate a circuit model for perisaccadic receptive-field (RF) remapping in the Lateral Intraparietal area (LIP) and Frontal Eye Fields (FEF).
  • To explain the mechanisms underlying visual stability and mislocalization phenomena observed during saccades.

Main Methods:

  • A circuit model incorporating center/surround connections and corollary discharge (CD)-gated directional connections was proposed.
  • The model simulates the updating of population activity representing stimulus retinal location across saccades.
  • Model predictions regarding remapping magnitudes and mislocalization were tested against experimental observations.

Main Results:

  • The model successfully explains both forward and backward translational mislocalization of flashed stimuli around saccades.
  • Mislocalization is attributed to insufficient or excessive updating of neural activity due to CD timing and visual latency.
  • Experimental validation confirmed that later flashes before saccades result in smaller forward remapping magnitudes post-saccade.

Conclusions:

  • A unified circuit mechanism explains receptive-field remapping, transsaccadic updating, and perisaccadic mislocalization.
  • The brain may employ "unaware" decoders that process neural activity without distinguishing its origin.
  • The findings offer insights into the neural basis of visual stability and spatial perception during eye movements.