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1Institute of Cognitive Neuroscience and Department of Psychology, University College London, London, United Kingdom; 2Department of Psychology, Birkbeck College, University of London, London, United Kingdom; and 3 Section of Neurological Rehabilitation, Department of Neurological and Visual Sciences, University of Verona, Verona, Italy
Submitted 5 December 2005; accepted in final form 17 January 2006
To gain insight into the neural basis of visual attention, we combined transcranial magnetic stimulation (TMS) and event-related potentials (ERPs) during a visual search task. Single-pulse TMS over right posterior parietal cortex (rPPC) delayed response times to targets during conjunction search, and this behavioral effect had a direct ERP correlate. The early phase of the N2pc component that reflects the focusing of attention onto target locations in a search display was eliminated over the right hemisphere when TMS was applied there but was present when TMS was delivered to a control site (vertex). This finding demonstrates that rPPC TMS interferes with attentional selectivity in remote visual areas.
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