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Cerebral Cortex Advance Access originally published online on March 28, 2004
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Cerebral Cortex August 2004; 14:851-857
© Oxford University Press 2004

Article

Serial Processing in the Human Somatosensory System

Koji Inui, Xiaohong Wang, Yohei Tamura, Yoshiki Kaneoke and Ryusuke Kakigi

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

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.


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