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Transcranial Magnetic Stimulation for Investigating Causal Brain-behavioral Relationships and their Time Course
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Contralateral visual search deficits following TMS.

I Schindler1, A Ellison, A D Milner

  • 1Department of Psychology, University of Hull, UK.

Journal of Neuropsychology
|October 14, 2009
PubMed
Summary

Transcranial magnetic stimulation impacts visual search differently based on brain site. Posterior parietal cortex stimulation impairs contralateral search, while superior temporal gyrus stimulation affects hemispace-specific array search.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Transcranial magnetic stimulation (TMS) can reveal causal links between brain regions and cognitive functions.
  • Previous research indicated differential effects of TMS on posterior parietal cortex (PPC) and superior temporal gyrus (STG) for conjunction versus feature visual search tasks.

Purpose of the Study:

  • To investigate the specific spatial deficits induced by TMS over PPC and STG when participants must make left/right location decisions.
  • To determine if these deficits are lateralized and dependent on the spatial configuration of visual search arrays.

Main Methods:

  • Non-invasive brain stimulation using TMS over PPC and STG in separate experimental blocks.
  • Participants performed visual search tasks using full-field or hemispace-presented structured arrays.
  • Performance was assessed based on accuracy and reaction time for target localization (left/right decision).

Main Results:

  • TMS over PPC resulted in a specific deficit in searching contralateral space with full-field arrays.
  • TMS over STG led to a specific deficit in identifying targets in contralateral portions of smaller, structured arrays presented within a hemispace.

Conclusions:

  • The findings demonstrate distinct, lateralized spatial processing roles for PPC and STG in visual search.
  • PPC is crucial for contralateral spatial awareness in a global search context.
  • STG plays a role in processing spatial information within specific hemifields, particularly in structured visual environments.