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1 Department of Psychology, Institute of Cognitive Neuroscience, University College London, London, United Kingdom; Department of Neurological and Visual Sciences, Section of Neurological Rehabilitation, University of Verona, Verona, Italy
2 Department of Neurological and Visual Sciences, Section of Neurological Rehabilitation, University of Verona, Verona, Italy
3 Department of Psychology, Institute of Cognitive Neuroscience, University College London, London, United Kingdom
4 Department of Psychology, Birkbeck College, University of London, London, United Kingdom
* To whom correspondence should be addressed. E-mail: gfuggetta{at}yahoo.it.
To gain insight into the neural basis of visual attention we combined transcranial magnetic stimulation (TMS) and event related potentials (ERP) during a visual search task. Single-pulse TMS over right posterior parietal cortex (rPPC) delayed response times to targets during conjunction search, and this behavioural 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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