Medical Journal of the Islamic Republic Of Iran
مجله پزشکی جمهوری اسلامی ایران
Med J Islam Repub Iran
Medical Sciences
http://mjiri.iums.ac.ir
2
journal2
1016-1430
2251-6840
8
10.18869/mjiri
14
8888
13
en
jalali
1376
2
1
gregorian
1997
5
1
11
1
online
1
fulltext
en
"DOMINANCY" IN THE SECOND SOMATOSENSORY AREA REVEALED BY MAGNE TOENCEPHALOGRAPHY
Biological Sciences
Biological Sciences
Original Research: Basic Science in Medicine
Original Research: Basic Science in Medicine
The second somatosensory area (SlI) has been studied both by electrical
evoked potentials24 and magnetoencephalography (MEG)5 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
SlI 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.5.6
Second somatosensory area, Magnetoencephalography, Evoked magnetic fields.
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http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-397&slc_lang=en&sid=1
A
A. ASGARI
20031947532846005236
20031947532846005236
Yes
From the Department of Physiology, Baghiyatollah University of Medical Sciences, Tehran
AI
WEIR
20031947532846005237
20031947532846005237
No
the •Wellcome Biomagnetism Unit. Department of Clinical Neurophysiology, lnstitute of Neurological Sciences, Southern General Hospital, Glasgow, UK.