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J Neurophysiol 100: 516-519, 2008. First published May 21, 2008; doi:10.1152/jn.01287.2007 Free Article
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Perceptual Load Modulates Visual Cortex Excitability to Magnetic Stimulation

Neil Muggleton1, Ruth Lamb2, Vincent Walsh1,3 and Nilli Lavie1,3

1Institute of Cognitive Neuroscience, 2Department of Anatomy and Developmental Biology, and 3Department of Cognitive Perceptual and Brain Sciences, University College London, London, United Kingdom

Submitted 26 November 2007; accepted in final form 19 May 2008

Much recent research has shown that the level of perceptual load in a task determines the perception of task-irrelevant stimuli and associated neural activity, but the mediating neural mechanisms remain unclear. Here we show that increasing the level of perceptual load in a static letter search task results in an increase in the intensity of transcranial magnetic stimulation over V5/MT required to elicit the perception of a moving phosphene. These findings suggest that the neural mechanisms mediating the effects of perceptual load involve reduced visual cortex excitability in task-unrelated areas.


Address for reprint requests and other correspondence: N. Lavie, Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK (E-mail: n.lavie{at}ucl.ac.uk)







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