Repository of Research and Investigative Information

Repository of Research and Investigative Information

Baqiyatallah University of Medical Sciences

Dominancy in the second somatosensory area revealed by magnetoencephalography

(1997) Dominancy in the second somatosensory area revealed by magnetoencephalography. Med J Islam Repub Iran. pp. 29-32. ISSN 10161430 (ISSN)

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The second somatosensory area (SII) has been studied both by electrical evoked potentials and magnetoencephalography (MEG). Magnetic evoked fields of contralateral primary somatosensory and ipsilateral second somatosensory cortices of 12 normal subjects were recorded in response to median nerve electrical stimulation by means of a single magnetometer. We detected, in addition to the usual contralateral SI responses, ipsilateral second somatosensory evoked fields (sSEF's) in 4 subjects at a latency of 35-45 ms over the dominant hemisphere for handedness, i.e., right hemisphere in left handed subjects and vice versa. On no occasion were ipsilateral somatosensory fields recorded from the non-dominant hemisphere whichever median nerve was stimulated. There were no consistent responses at 90-150 ms. We concluded that the ipsilateral responses were from the SII area. Our observations indicate the following: a) despite the known bilateral representation of SII, there is hemispheric dominance, b) we could not confirm the long latency (>95 ms) signals reported by Hari et al. in any of our subjects.

Item Type: Article
Keywords: Evoked magnetic fields Magnetoencephalography Second somatosensory area article electrostimulation evoked response female hemispheric dominance human male median nerve nerve stimulation normal human right hemisphere somatosensory cortex
Page Range: pp. 29-32
Journal or Publication Title: Med J Islam Repub Iran
Journal Index: Scopus
Volume: 11
Number: 1
ISSN: 10161430 (ISSN)
Depositing User: مهندس مهدی شریفی

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