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Modulation of Human Visual Cortex by Crossmodal Spatial Attention
Emiliano Macaluso,12*Chris D. Frith,2Jon Driver1
A sudden touch on one hand can improve vision near that
hand, revealing crossmodal links in spatial attention. It is oftenassumed that such links involve only multimodal neural structures,but
unimodal brain areas may also be affected. We tested the effectof
simultaneous visuo-tactile stimulation on the activity of thehuman
visual cortex. Tactile stimulation enhanced activity inthe visual
cortex, but only when it was on the same side as avisual target.
Analysis of effective connectivity between brainareas suggests that
touch influences unimodal visual cortex viaback-projections from
multimodal parietal areas. This providesa neural explanation for
crossmodal links in spatial attention.
1 Institute of Cognitive Neuroscience,
University College London, UK.
2 Wellcome Department
of Cognitive Neurology, Institute of Neurology, London, UK.
*
To whom correspondence should be addressed. E-mail:
e.macaluso{at}fil.ion.ucl.ac.uk
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