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Predictive position computations mediated by parietal areas: TMS evidence.

Grace Edwards1, Céline Paeye2, Philippe Marque3

  • 1Centre de Recherche Cerveau et Cognition (CerCo), CNRS & Université Paul Sabatier, Pavillon Baudot CHU Purpan, Toulouse Cedex, France; Laboratoire Psychologie de la Perception, 45 Rue des Saint-Pères, 75006 Paris, France; Cognitive Neuropsychology Laboratory, Harvard University, William James Hall - 9th floor, 33 Kirkland Street, Cambridge, MA 02138, United States.

Neuroimage
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Summary

Repetitive transcranial magnetic stimulation (rTMS) over the intraparietal sulcus (IPS) impaired visual perception of object position during eye movements and motion. This suggests the right IPS is crucial for predictive localization and motion processing.

Keywords:
Flash grabFrontal eye fields (FEF)Intraparietal sulcus (IPS)Predictive position perceptionTrans-saccadic fusionTranscranial magnetic stimulation (TMS)

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • The visual system predicts target positions during object or eye movements.
  • Predictive localization involves frontal eye fields (FEF), intraparietal sulcus (IPS), and medial temporal area (MT).

Purpose of the Study:

  • To investigate the causal role of right FEF, IPS, and MT in predictive position perception.
  • To examine the effects of repetitive transcranial magnetic stimulation (rTMS) on trans-saccadic fusion and the flash grab illusion.

Main Methods:

  • Two experiments using rTMS applied to right FEF, right IPS, right MT, and a control site (V1/V2).
  • Participants' perception of trans-saccadic fusion and the flash grab illusion was assessed after stimulation.

Main Results:

  • rTMS to the right IPS significantly reduced the perception of trans-saccadic fusion.
  • rTMS to the right IPS also significantly decreased the illusory shift in the flash grab illusion in a stronger version of the task.

Conclusions:

  • The right IPS plays a significant role in predictive position perception during saccades.
  • Right IPS is involved in motion processing contributing to visual illusions like the flash grab.