Journal
CEREBRAL CORTEX
Volume 17, Issue 12, Pages 2878-2891Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhm015
Keywords
digit; fMRI; hand; skin; somatic; touch
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Funding
- NEI NIH HHS [F32 EY007028, R01 EY012925, EY07028-02, EY12925] Funding Source: Medline
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Behavioral tactile discrimination thresholds were compared with functional magnetic resonance imaging measurements of cortical finger representations within primary somatosensory cortex (S1) for 10 human subjects to determine whether cortical magnification in S1 could account for the variation in tactile hyperacuity thresholds of the fingers. Across 10 subjects, the increase in tactile thresholds from the index finger to the little finger correlated with the decrease in cortical representation across fingers in S1. Additionally, representations of the fingers within S1, in Brodmann areas 3b and 1, were also correlated with the thresholds. These results suggest that tactile hyperacuity is largely determined by the cortical representation of the fingers in S1.
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