A study of temporal aspect of posterior parietal cortex in visual search using transcranial magnetic stimulation

Sheng Ge, Akira Matsuoka, Shoogo Ueno, Keiji Iramina

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It is known that the posterior parietal cortex (PPC) plays a dominant role in spatial processing during visual search. However, the temporal aspect of the PPC is unclear. In the present study, to investigate the temporal aspects of the PPC in feature search, we applied Transcranial Magnetic Stimulation (TMS) over the right PPC with the TMS stimulus onset asynchronies (SOAs) set at 100, 150, 200 and 250 ms after visual search stimulation. We found that when SOA was set at 150 ms, compared to the sham TMS condition, there was a significant elevation in response time when TMS pulses were applied. However, there was no significant difference between the TMS and sham TMS conditions for the other SOA settings. Therefore, we suggest that the spatial processing of feature search is probably processed in the posterior parietal cortex at about 150-170 ms after visual search stimuli presentation.

Original languageEnglish
Pages (from-to)1651-1657+23
JournalIEEJ Transactions on Electronics, Information and Systems
Issue number10
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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