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Cerebral Cortex Advance Access published online on March 28, 2004
Cerebral Cortex, doi:10.1093/cercor/bhh043
© 2004 by Oxford University Press
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Article

Serial Processing in the Human Somatosensory System

Koji Inui 1*, Xiaohong Wang 1, Yohei Tamura 1, Yoshiki Kaneoke 1, Ryusuke Kakigi 1

1 Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki 444-8585, Japan

* To whom correspondence should be addressed. E-mail: inui{at}nips.ac.jp.


  Abstract

Although numerous anatomical and electrophysiological findings in animal studies have supported a hierarchical scheme of somatosensory processing, precise activation timings of each cortical area are not known. Therefore we examined the temporal relationship of activities among multiple cortical areas using magnetoencephalography in humans. We found activations in Brodmann's areas 3b, 4, 1, 5 and the secondary somatosensory cortex region in the right hemisphere following transcutaneous electrical stimulation of the dorsum of the left hand. The mean onset latencies of each cortical activity were 14.4, 14.5, 18.0, 22.4 and 21.7 ms, respectively. The differences of onset latencies among these activations indicated the serial mode of processing both through the postcentral gyrus and through the primary and secondary somatosensory cortices.

Key Words: cortex, human, serial processing, somatosensory system


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