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Neural Substrates of Perceptual Enhancement by Cross-Modal Spatial Attention

Simon Fraser University, Burnaby, BC, Canada

Wolfgang A. Teder-Sälejärvi

University of California–San Diego

Francesco Di Russo

University of California–San Diego
IRCCS Fondazione Santa Lucia, Rome, Italy

Steven A. Hillyard

University of California–San Diego

Orienting attention involuntarily to the location of a sudden sound improves perception of subsequent visual stimuli that appear nearby. The neural substrates of this cross-modal attention effect were investigated by recording event-related potentials to the visual stimuli using a dense electrode array and localizing their brain sources through inverse dipole modeling. A spatially nonpredictive auditory precue modulated visual-evoked neural activity first in the superior temporal cortex at 120–140 msec and then in the ventral occipital cortex of the fusiform gyrus 15–25 msec later. This spatio-temporal sequence of brain activity suggests that enhanced visual perception produced by the cross-modal orienting of spatial attention results from neural feedback from the multimodal superior temporal cortex to the visual cortex of the ventral processing stream.

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