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Abstract
Multiple synaptic interconnections in the human brain support concerted rhythmic activity
of a large number of cortical neurons, typically close to 10 and 20 Hz. Our present
neuromagnetic data provide evidence for distinct functional roles of these spectral
components in the somatomotor cortex. The sites of suppression during movement and
the subsequent rebound of the 20-Hz rhythm followed, along the motor cortex, the representation
of fingers, toes, and mouth, as opposed to the stable origin of the 10-Hz rhythms
close to the hand somatosensory cortex. The 20-Hz activity appears to be a signature
of active immobilization following movement, whereas the reactive 10-Hz signals likely
reflect lack of relevant sensory input from the important upper limbs.