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A circuit model for transsaccadic space updating and mislocalization.

Xiao Wang1,2, Sophia J Tsien3, Min Jin1

  • 1Division of Psychology, State Key Laboratory of Cognitive Neuroscience and Learning, International Data Group/McGovern Institute for Brain Research, Beijing Normal University, Beijing 100875, China.

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|May 19, 2025
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Summary

Our circuit model explains how the brain maintains visual stability during eye movements (saccades). It shows how receptive field remapping in LIP and FEF areas accounts for perceptual stability and flash mislocalization.

Keywords:
RF remappingaware and unaware decodersdouble-step saccadeefference copymemory mislocalization

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • The brain maintains a stable perception of the world despite rapid eye movements (saccades) that drastically alter retinal images.
  • However, stimuli briefly presented around saccades can be significantly mislocalized, creating a paradox with stable perception of persistent objects.

Purpose of the Study:

  • To address the puzzle of visual stability and perisaccadic mislocalization using a proposed circuit model.
  • To investigate the mechanisms of receptive-field (RF) remapping in the lateral interparietal area (LIP) and frontal eye fields (FEF) during saccades.

Main Methods:

  • Utilized a circuit model incorporating center-excitation/surround-inhibition connections to represent stimulus location in memory.
  • Modeled RF remapping as a continuous backward shift of population activity, gated by corollary discharge (CD) of saccade commands.
  • Simulated the model's response to persistent stimuli and flashes presented before, during, and after saccades.

Main Results:

  • The model successfully accounts for the stability of persistent objects across saccades.
  • It reproduces the observed forward and backward translational mislocalization of flashed stimuli around saccade onset and offset.
  • Confirmed model predictions that forward remapping magnitudes decrease for later flashes preceding saccades.

Conclusions:

  • Transsaccadic visual stability is achieved by updating an object's presaccadic retinal position to its postsaccadic position.
  • The brain's 'unaware' decoders, which do not differentiate activity origins, contribute to this stable perception.
  • The model elucidates the role of RF remapping dynamics and corollary discharge in resolving visual perception across eye movements.