Blood flow changes in human somatosensory cortex during anticipated stimulation - PubMed (original) (raw)

. 1995 Jan 19;373(6511):249-52.

doi: 10.1038/373249a0.

Affiliations

• PMID: 7816140
• DOI: 10.1038/373249a0

Blood flow changes in human somatosensory cortex during anticipated stimulation

W C Drevets et al. Nature. 1995.

Abstract

Positron emission tomography (PET) measurements of brain blood flow were used to monitor changes in the human primary and secondary somatosensory cortices during the period when somatosensory stimuli were expected. In anticipation of either focal or innocuous touching, or localized, painful shocks, blood flow decreased in parts of the primary somatosensory cortex map located outside the representation of the skin area that was the target of the expected stimulus. Specifically, attending to an impending stimulus to the fingers produced a significant decrease in blood flow in the somatosensory zones for the face, whereas attending to stimulation of the toe produced decreases in the zones for the fingers and face. Decreases were more prominent in the side ipsilateral to the location of the expected stimulus. No significant changes in blood flow occurred in the region of the cortex representing the skin locus of the awaited stimulation. These results are concurrent with a model of spatial attention in which potential signal enhancement may rely on generalized suppression of background activity.

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Comment in

• Neuropsychology. Modulation by instruction.
  Posner M. Posner M. Nature. 1995 Jan 19;373(6511):198-9. doi: 10.1038/373198b0. Nature. 1995. PMID: 7816131 No abstract available.

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