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The interaction of brain regions during visual search processing as revealed by transcranial magnetic stimulation

Ellison, A.; Lane, A.R.; Schenk, T.

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Authors

T. Schenk



Abstract

Although it has long been known that right posterior parietal cortex (PPC) has a role in certain visual search tasks, and human motion area V5 is involved in processing tasks requiring attention to motion, little is known about how these areas may interact during the processing of a task requiring the speciality of each. Using transcranial magnetic stimulation (TMS), this study first established the specialization of each area in the form of a double dissociation; TMS to right PPC disrupted processing of a color/form conjunction and TMS to V5 disrupted processing of a motion/form conjunction. The key finding of this study is, however, if TMS is used to disrupt processing of V5 at its critical time of activation during the motion/form conjunction task, concurrent disruption of right PPC now has a significant effect, where TMS at PPC alone does not. Our findings challenge the conventional interpretation of the role of right PPC in conjunction search and spatial attention.

Citation

Ellison, A., Lane, A., & Schenk, T. (2007). The interaction of brain regions during visual search processing as revealed by transcranial magnetic stimulation. Cerebral Cortex, 17(11), 2579-2584. https://doi.org/10.1093/cercor/bhl165

Journal Article Type Article
Publication Date Nov 1, 2007
Deposit Date Oct 17, 2008
Publicly Available Date Mar 29, 2024
Journal Cerebral Cortex
Print ISSN 1047-3211
Electronic ISSN 1460-2199
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 17
Issue 11
Pages 2579-2584
DOI https://doi.org/10.1093/cercor/bhl165
Keywords Attention, Conjunction search, Motion processing, Posterior parietal cortex, TMS, V5.

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