The temporal profile of interactions between sensory information from bothhands in the secondary somatosensory cortex

Citation
Y. Hamada et al., The temporal profile of interactions between sensory information from bothhands in the secondary somatosensory cortex, CLIN NEU, 112(7), 2001, pp. 1326-1333
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Neurosciences & Behavoir
Journal title
CLINICAL NEUROPHYSIOLOGY
ISSN journal
1388-2457 → ACNP
Volume
112
Issue
7
Year of publication
2001
Pages
1326 - 1333
Database
ISI
SICI code
1388-2457(200107)112:7<1326:TTPOIB>2.0.ZU;2-I
Abstract
Objective: To elucidate the temporal profile of interactions between sensor y information from both hands in the somatosensory cortex. Methods: Somatosensory evoked fields (SEFs), generated by stimulation appli ed to the right index finger after a preceding stimulation to the left inde x finger, were recorded using a whole head-type magnetoencephalography (MEG ). The paired electrical stimuli were applied with a stimulation onset asyn chrony (SOA) of 50, 100, 200, 300, or 400 ms. Results: The mean SEF intensities in the primary somatosensory area (SI) of five subjects, which were evoked approximately t0 ms after the latter of t he paired stimuli, were not significantly smaller than that evoked in the c ontrol condition when only the right linger was stimulated. In contrast, SE Fs in the secondary somatosensory area (SII), generated approximately 100 m s after the stimuli, were suppressed when the paired stimuli were applied a t an SOA of 100 ms (P < 0.05, t test). In addition, SEFs at approximately 1 50 ms after the stimuli were significantly suppressed at SOAs of 50, 100 (P < 0.05), 200, and 300 ms (P < 0.1). Conclusion: Within a time window of approximately 300 ms, sensory informati on from the left finger significantly affected the SEFs generated by sensor y inputs from the right finger. This time window may be required for the in tegration of sensory input. (C) 2001 Elsevier Science Ireland Ltd. All righ ts reserved.