Journal
BEHAVIOURAL BRAIN RESEARCH
Volume 135, Issue 1-2, Pages 141-145Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0166-4328(02)00143-2
Keywords
somatosensory cortex; magnetoencephalography; human; SI; SII
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Magnetoencephalographic (MEG) recordings allow noninvasive monitoring of simultaneously active brain areas with reasonable spatial and excellent temporal resolution. Whole-scalp neuromagnetic recordings show activation of contralateral primary (SI) and bilateral second (SII) somatosensory cortices to unilateral median nerve stimulation. Recent MEG studies on healthy and diseased human subjects have shown some functional characteristics of SII cortex. Besides tactile input, the SII cortex also responds to nociceptive afferents. The SII activation is differentially modulated by isometric muscle contraction of various body parts. Lesions in the SII cortex may disturb the self-perception of body scheme. Moreover, the SI and SII cortices may be sequentially activated within one hemisphere, but the SII cortex may also receive direct peripheral input on the ipsilateral side. (C) 2002 Elsevier Science B.V. All rights reserved.
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