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The role of the right posterior parietal cortex in temporal order judgment

Cited 36 time in Web of Science Cited 38 time in Scopus
Authors
Woo, Sung-Ho; Kim, Ki-Hyun; Lee, Kyoung-Min
Issue Date
2009
Publisher
Elsevier
Citation
Brain Cogn. 69(2):337-343
Keywords
AdultFemaleHumansJudgment/*physiologyMaleParietal Lobe/*physiologyPhotic StimulationPsychomotor Performance/physiologyTime Perception/*physiologyTranscranial Magnetic StimulationYoung Adult
Abstract
Perceived order of two consecutive stimuli may not correspond to the order of their physical onsets. Such a disagreement presumably results from a difference in the speed of stimulus processing toward central decision mechanisms. Since previous evidence suggests that the right posterior parietal cortex (PPC) plays a role in modulating the processing speed of a visual target, we applied single-pulse TMS over the region in 14 normal subjects, while they judged the temporal order of two consecutive visual stimuli. Stimulus-onset-asynchrony (SOA) randomly varied between -100 and 100 ms in 20-ms steps (with a positive SOA when a target appeared on the right hemi-field before the other on the left), and a point of subjective simultaneity was measured for individual subjects. TMS stimulation was time-locked at 50, 100, 150, and 200 ms after the onset of the first stimulus, and results in trials with TMS on right PPC were compared with those in trials without TMS. TMS over the right PPC delayed the detection of a visual target in the contralateral, i.e., left hemi-field by 24 (+/-7 SE) ms and 16 (+/-4 SE) ms, when the stimulation was given at 50 and 100 ms after the first target onset. In contrast, TMS on the left PPC was not effective. These results show that the right PPC is important in a timely detection of a target appearing on the left visual field, especially in competition with another target simultaneously appearing in the opposite field.
ISSN
1090-2147 (Electronic)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=18809233

http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WBY-4TGY467-1-C&_cdi=6723&_user=168665&_orig=search&_coverDate=03%2F31%2F2009&_sk=999309997&view=c&wchp=dGLbVtz-zSkzV&md5=1a0dcc2a8e151f6c15c954370ef69242&ie=/sdarticle.pdf

http://hdl.handle.net/10371/68455
DOI
https://doi.org/10.1016/j.bandc.2008.08.006
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College of Medicine/School of Medicine (의과대학/대학원)Dept. of Neurology (신경과학교실)Journal Papers (저널논문_신경과학교실)
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