Modulation of human visual cortex by crossmodal spatial attention.

A sudden touch on one hand can improve vision near that hand, revealing crossmodal links in spatial attention. It is often assumed that such links involve only multimodal neural structures, but unimodal brain areas may also be affected. We tested the effect of simultaneous visuo-tactile stimulation on the activity of the human visual cortex. Tactile stimulation enhanced activity in the visual cortex, but only when it was on the same side as a visual target. Analysis of effective connectivity between brain areas suggests that touch influences unimodal visual cortex via back-projections from multimodal parietal areas. This provides a neural explanation for crossmodal links in spatial attention.

[1]  Rodney J. Douglas,et al.  Feedback interactions between neuronal pointers and maps for attentional processing , 1999, Nature Neuroscience.

[2]  C. Spence,et al.  Attention and the crossmodal construction of space , 1998, Trends in Cognitive Sciences.

[3]  C. Spence,et al.  Cross-modal links in exogenous covert spatial orienting between touch, audition, and vision , 1998, Perception & psychophysics.

[4]  C. Gross,et al.  Spatial maps for the control of movement , 1998, Current Opinion in Neurobiology.

[5]  Elisabetta Làdavas,et al.  Seeing where your hands are , 1997, Nature.

[6]  D. J. Felleman,et al.  Cortical connections of areas V3 and VP of macaque monkey extrastriate visual cortex , 1997, The Journal of comparative neurology.

[7]  M. Corbetta,et al.  A PET study of visuospatial attention , 1993, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[8]  R. M. Siegel,et al.  Corticocortical connections of anatomically and physiologically defined subdivisions within the inferior parietal lobule , 1990, The Journal of comparative neurology.

[9]  A. Caramazza.  Cognitive Neuropsychology and Neurolinguistics: Advances in Models of Cognitive Function and Impairment , 1990 .

[10]  M. Farah,et al.  Parietal lobe mechanisms of spatial attention: Modality-specific or supramodal? , 1989, Neuropsychologia.

[11]  H. Buchtel,et al.  Spatial attentional shifts: Further evidence for the role of polysensory mechanisms using visual and tactile stimuli , 1989, Neuropsychologia.

[12]  M. Mesulam,et al.  Right cerebral dominance in spatial attention. Further evidence based on ipsilateral neglect. , 1987, Archives of neurology.

[13]  C. L. M..  The Psychology of Attention , 1890, Nature.