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PIERS Online
Vol. 3
No. 1
2007
pp: 111-113Temporal Analysis of Visual Search Task by Transcranial Magnetic StimulationSheng Ge, Shoogo Ueno, and Keiji Iramina doi:10.2529/PIERS060906045142 Downloads: 899 Abstract:In this study, we examined the temporal aspects of the right posterior parietal cortex in easy feature ``pop-out" visual search using transcranial magnetic stimulation (TMS). The transcranial magnetic stimulations were applied over the right posterior parietal cortex of subjects. Subjects received 4 tests which the TMS onset times were set as 100, 150, 200 and 250 msec after visual stimulus presentation. We found that, when SOA=150 msec, compared to no-TMS condition, there was a significant elevation in response time when the TMS pluses were applied. However for the other SOA cases, there was no significant difference between TMS and no-TMS conditions. Therefore, we considered that ``pop-out" visual search was processed in the right posterior parietal cortex at about 150 msec after stimulus present.References:1. Ellison, A., I. Schindler, L. L. Pattison, and A. D. Milner, "An exploration of the role of the superior temporal gyrus in visual search and spatial perception using TMS," Brain, Vol. 127, 2307-2315, 2004. 2. Ashbridge, E., V. Walsh, and A. Cowey, "Temporal aspects of visual search studied by transcranial magnetic stimulation," Neuropsychologia, Vol. 35, 1121-1131, 1997. 3. Corbetta, M., G. L. Shulman, F. M. Miezin, and S. E. Petersen, "Superior parietal cortex activation during spatial attention shifts and visual feature conjunction," Science, Vol. 270, 802-805, 1995. 4. Wojciulik, E. and N. Kanwisher, "The generality of parietal involvement in visual attention," Neuron, Vol. 23, 747-764, 1999. 5. Sereno, A. B. and J. H. R. Maunsell, "Shape selectivity in primate lateral intraparietal cortex," Nature, Vol. 395, 500-503, 1998. 6. Leonards, U., S. Sunaert, P. van Hecke, and G. A. Orban, "Attention mechanisms in visual search --- an fMRI study," Journal of Cognitive Neuroscience, Vol. 12, supplement 2, 61-75, 2000. 7. Donner, T. H., A. Kettermann, E. Diesch, F. Ostendorf, A. Villringer, and S. A. Brandt, "Visual feature and conjunction searches of equal difficulty engage only partially overlapping frontoparietal networks," Neuroimage, Vol. 15, No. 1, 16-25, 2002. |
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