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Does TMS on V3 block conscious visual perception?

Niina Salminen-Vaparanta1, Mika Koivisto1, Victor Vorobyev1

  • 1The Department of Psychology, University of Turku, Assistentinkatu 7, 20014 Turku, Finland; Centre for Cognitive Neuroscience, University of Turku, Finland.

Neuropsychologia
|November 16, 2017
PubMed
Summary
This summary is machine-generated.

Extrastriate V3, like V1 and V2, is crucial for visual consciousness. This study found that disrupting V3 with transcranial magnetic stimulation (TMS) impairs conscious visual perception, confirming its causal role.

Keywords:
Cerebral cortexFMRITMSV2V3Visual consciousness

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Primary visual cortex (V1) and extrastriate V2 are established as essential for visual consciousness.
  • The specific role of extrastriate V3 in visual consciousness remains unclear.

Purpose of the Study:

  • To investigate the causal contribution of V3 to human visual consciousness.
  • To determine if intact V3 processing is necessary for conscious visual perception.

Main Methods:

  • Utilized neuronavigated transcranial magnetic stimulation (TMS) targeting V2 and V3.
  • Employed a computational model of TMS-induced electric fields.
  • Assessed the impact of TMS on conscious visual perception, including feature detection and stimulus discrimination.

Main Results:

  • TMS disruption of V3, similar to V2, interfered with conscious perception of features and stimulus detection.
  • V3 stimulation showed a significant, though less pronounced, effect on conscious stimulus presence detection compared to V2.
  • V3 was found to be necessary for general visual perception, not exclusively for visual consciousness.

Conclusions:

  • Extrastriate V3 causally contributes to the generation of basic visual consciousness, alongside V1 and V2.
  • V3 plays a necessary role in overall visual perception.
  • These findings advance our understanding of the neural basis of visual awareness.