Activation of human SII cortex during exploratory finger movement and hand clenching tasks.
We used electric median nerve stimuli to elucidate the functional properties of neurons in the human secondary somatosensory cortex during exploration of small objects and muscle contraction. Somatosensory evoked fields were recorded from nine healthy subjects with a 204-channel neuromagnetometer. Electrical stimuli were applied once every 3 s to the left median nerve at the wrist. The conditions during the stimulation were rest (control session), exploration of small objects (exploration session) and clenching the hand while the wrist was being electrically stimulated (clench session). The strengths of equivalent current dipoles of evoked fields from the secondary somatosensory cortex were increased during the exploration session, but those of evoked fields were decreased by the clench session.
Horie
Nobuko
N
Department of Clinical Neuroscience and Therapeutics, Hiroshima University, Graduate School of Biomedical Sciences, Japan.
Inoue
Ken
K
Shirai
Takushi
T
Hashizume
Akira
A
Nakanishi
Kazuyoshi
K
Harada
Toshihide
T
Kawakami
Hideshi
H
Kohriyama
Tatsuo
T
Mimori
Yasuyo
Y
Matsumoto
Masayasu
M
D000328:Adult; D000704:Analysis of Variance; D004558:Electric Stimulation / Q000379:methods; D005106:Exploratory Behavior / Q000502:physiology; D005385:Fingers / Q000502:physiology*; D006225:Hand / Q000502:physiology; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D013003:Somatosensory Cortex / Q000502:physiology*