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Related Experiment Videos

TMS effect on visual search task.

Sheng Ge1, Akira Matsuoka, Shoogo Ueno

  • 1Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka, Japan.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|October 20, 2007
PubMed
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Transcranial magnetic stimulation (TMS) revealed the right posterior parietal cortex is crucial for "pop-out" visual search around 150 milliseconds after stimulus presentation. Disrupting this area at 150ms significantly slowed search times, confirming its role.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The posterior parietal cortex (PPC) plays a key role in visual attention and search.
  • Understanding the precise temporal dynamics of PPC involvement in visual search is crucial.

Purpose of the Study:

  • To investigate the temporal involvement of the right posterior parietal cortex (PPC) in visual search tasks.
  • To determine the specific timing of PPC activation during feature "pop-out" visual searches.

Main Methods:

  • Utilized transcranial magnetic stimulation (TMS) over the right PPC in human subjects.
  • Administered TMS at varying stimulus onset asynchrony (SOA) intervals: 100, 150, 200, and 250 ms.
  • Compared response times under TMS and no-TMS conditions for easy and hard feature search tasks.

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Main Results:

  • A significant increase in response time was observed when TMS was applied at an SOA of 150 ms.
  • No significant differences in response times were found for SOAs of 100, 200, or 250 ms compared to the no-TMS condition.
  • These findings suggest a critical temporal window for PPC engagement in visual search.

Conclusions:

  • The right posterior parietal cortex (PPC) is critically involved in "pop-out" visual search approximately 150 ms after stimulus presentation.
  • This temporal window highlights the specific role of the right PPC in rapid visual processing and attentional guidance during search tasks.