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The Journal of Neurophysiology Vol. 81 No. 5 May 1999, pp. 2017-2025
Copyright ©1999 by the American Physiological Society
1Brain Research Unit,
Karhu, J. and
C. D. Tesche.
Simultaneous Early Processing of Sensory Input in Human Primary
(SI) and Secondary (SII) Somatosensory Cortices. J. Neurophysiol. 81: 2017-2025, 1999.
Simultaneous early processing of sensory input in human primary (SI)
and secondary (SII) somatosensory cortices. The anatomic connectivity of the somatosensory system supports the simultaneous participation of widely separated cortical areas in the early processing of sensory input. We recorded evoked neuromagnetic responses
noninvasively from human primary (SI) and secondary (SII) somatosensory
cortices to unilateral median nerve stimulation. Brief current pulses
were applied repetitively to the median nerve at the wrist at 2 Hz for
800-1,500 trials. A single pulse was omitted from the train at random
intervals (15% of omissions). We observed synchronized neuronal
population activity in contralateral SII area 20-30 ms after
stimulation, coincident in time with the first responses generated in
SI. Both contra- and ipsilateral SII areas showed prominent activity at
50-60 ms with an average delay of 13 ms for ipsilateral compared with
contralateral responses. The refractory behavior of the early SII
responses to the omissions differed from those observed at ~100 ms,
indicative of distinct neuronal assemblies responding at each latency.
These results indicate that SII and/or associated cortices in parietal
operculum, often viewed as higher-order processing areas for
somatosensory perception, are coactivated with SI during the early
processing of intermittent somatosensory input.
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