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TMS over posterior parietal cortex disrupts trans-saccadic visual stability.

Thérèse Collins1, Pierre O Jacquet2

  • 1Laboratoire Psychologie de la Perception, Université Paris Descartes & CNRS, 45 rue des Saints-Pères 75006 Paris, France.

Brain Stimulation
|December 17, 2017
PubMed
Summary

Visual stability relies on efference copy mechanisms. Transcranial magnetic stimulation (TMS) revealed that parietal cortex disruption impairs eye-centered coding, suggesting its crucial role in maintaining visual stability during saccadic eye movements.

Keywords:
SaccadeTMSVisual stability

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Saccadic eye movements shift visual input, yet perception remains stable.
  • Visual stability is thought to involve an efference copy mechanism that cancels self-induced retinal motion.

Purpose of the Study:

  • Investigate the neural mechanisms of visual stability using transcranial magnetic stimulation (TMS).
  • Examine the role of frontal eye fields (FEF) and parietal cortex in efference copy and visual stability.

Main Methods:

  • Utilized the double-step and in-flight displacement tasks to assess efference copy.
  • Applied online 3-pulse TMS to FEF, parietal cortex, or vertex during saccade execution.
  • Measured saccade metrics and spatiotopic performance post-TMS.

Main Results:

  • TMS over FEF affected ongoing saccade metrics in the double-step task.
  • Parietal cortex TMS, but not FEF or vertex TMS, altered performance in the in-flight displacement task.
  • Disruption of parietal cortex function impacted eye-centered position coding.

Conclusions:

  • Parietal cortex plays a causal role in maintaining trans-saccadic correspondence and visual stability.
  • TMS-induced disruption of parietal eye-centered maps underlies impaired visual stability.