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Perisaccadic Receptive Field Expansion in the Lateral Intraparietal Area.

Xiaolan Wang1, C C Alan Fung2, Shaobo Guan3

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The brain expands neuronal receptive fields beyond immediate and future locations during eye movements (saccades). This visual remapping ensures accurate spatial representation despite constant eye motion.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • The brain maintains a stable perception of visual space despite rapid eye movements called saccades.
  • Neuronal receptive field remapping is a proposed mechanism to achieve this visual stability.
  • Existing models suggest remapping involves current and future receptive fields relative to saccade initiation.

Purpose of the Study:

  • To investigate the full extent of neuronal remapping during saccades.
  • To determine if neuronal activity encompasses more than just the current and future receptive fields.
  • To model the underlying neural dynamics of perisaccadic receptive field expansion.

Main Methods:

  • Electrophysiological recordings in monkeys during saccades.
  • Presentation of probe stimuli to map neuronal receptive fields.
  • Development of a computational model simulating cortical activity propagation.

Main Results:

  • Perisaccadic neuronal excitability extends beyond the current and future receptive fields.
  • The entire visual space swept by the receptive field during a saccade shows enhanced neuronal activity.
  • A computational model supports a wave propagation mechanism across the cortex for this expanded remapping.

Conclusions:

  • Neuronal receptive fields expand significantly during saccades, covering the entire trajectory of movement.
  • This expanded remapping, potentially driven by activity waves, contributes to stable visual spatial representation.
  • The findings challenge previous notions of remapping limited to specific receptive field locations.