Cortical Activation Associated with Passive Movements of the Human Index Finger: An MEG Study
2002; Elsevier BV; Volume: 15; Issue: 3 Linguagem: Inglês
10.1006/nimg.2001.1010
ISSN1095-9572
AutoresFlamine Alary, Carla Simões, Veikko Jousmäki, Nina Forss, Riitta Hari,
Tópico(s)Transcranial Magnetic Stimulation Studies
ResumoWe recorded somatosensory evoked fields to passive extensions of the left and right index fingers in eight healthy adults. A new nonmagnetic device was designed to produce calibrated extensions of 19°, with a mean angular velocity of 630°/s. The responses, recorded with a 306-channel neuromagnetometer, were modeled with current dipoles. The earliest activation was in the primary somatosensory cortex, with peaks at 36–58 and 30–82 ms for left and right index finger extensions, respectively. Later signals were observed in the left second somatosensory (SII) cortex in six of eight subjects at 75–175 and 75–155 ms for left- and right-sided extensions, respectively; three subjects showed bilateral SII activation in at least one condition. Our results suggest a predominant role for the human left SII cortex in proprioceptive processing.
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