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TMS can reveal contrasting functions of the dorsal and ventral visual processing streams.

Ellison, A. and Cowey, A. (2006) 'TMS can reveal contrasting functions of the dorsal and ventral visual processing streams.', Experimental brain research., 175 (4). pp. 618-625.

Abstract

In order to investigate the functional specificity of the dorsal and ventral visual processing steams we used transcranial magnetic stimulation (TMS) to briefly disrupt one or the other while subjects performed three tasks, involving discrimination of colour or shape or relative position. TMS was delivered over right posterior parietal cortex (PPC) or right lateral occipital (LO) cortex, regions known to have visuo-spatial and object processing properties respectively. LO but not PPC stimulation had a significant effect on reaction time when subjects were asked to make a discrimination of relative shape. PPC stimulation had a significant effect when subjects were asked to discriminate relative position of the same shapes. Stimulation of LO also lengthened reaction times on the position task. There were no effects of stimulation at either site on colour discrimination. Results are discussed within the framework of how the dorsal stream and ventral stream are dissociated following their damage in neurological patients and possible ways in which they may interact in the normal brain.

Item Type:Article
Keywords:Ventral stream, Dorsal stream, Visual discrimination, Transcranial magnetic stimulation.
Full text:PDF - Accepted Version (362Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1007/s00221-006-0582-8
Publisher statement:The original publication is available at www.springerlink.com
Record Created:17 Oct 2008
Last Modified:03 Oct 2011 16:52

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