Distal-to-proximal representation of volar index finger in human area 3b

In area 3b of the monkey primary somatosensory cortex SI, the proximal phalanges of the fingers are represented close to the surface and the fingertips in the depth of the central sulcus. To study whether a similar arrangement might exist in humans, we applied tactile stimuli to the distal and proxi...

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Bibliographic Details
Published in:NeuroImage (Orlando, Fla.) Fla.), 2004-02, Vol.21 (2), p.696-700
Main Authors: Hlushchuk, Yevhen, Forss, Nina, Hari, Riitta
Format: Article
Language:English
Subjects:
Adult
Animals
Brain Mapping
Cytoarchitectonic area 3b
Distal-to-proximal finger representation
Evoked Potentials, Somatosensory - physiology
Female
Fingers - innervation
Functional Laterality - physiology
Haplorhini
Human
Humans
Magnetoencephalography
Male
Mechanoreceptors - physiology
Neurons - physiology
Primary somatosensory cortex
Reference Values
Signal Processing, Computer-Assisted
Somatosensory Cortex - physiology
Species Specificity
Tactile stimuli
Touch - physiology
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Summary:In area 3b of the monkey primary somatosensory cortex SI, the proximal phalanges of the fingers are represented close to the surface and the fingertips in the depth of the central sulcus. To study whether a similar arrangement might exist in humans, we applied tactile stimuli to the distal and proximal phalanges of the index finger in 11 healthy adults. Cortical somatosensory evoked fields were recorded with a whole-scalp neuromagnetometer. The sources of the responses were situated in the posterior wall of the central sulcus, statistically significantly more superior to proximal than distal stimuli, with a mean difference of 3.1 mm. Thus the distal-to-proximal representation of the index finger shows a similar order in human and monkey SI cortex.
ISSN:1053-8119
1095-9572
DOI:10.1016/j.neuroimage.2003.09.064