Evidence for a 7- to 9-Hz "sigma" rhythm in the human SII cortex

被引：12

作者：

Narici, L

Forss, N

Jousmäki, V

Peresson, M

Hari, R

机构：

[1] Aalto Univ, Brain Res Unit, Low Temp Lab, FIN-02015 Espoo, Finland

[2] Univ Roma Tor Vergata, Dept Phys, I-00133 Rome, Italy

[3] Fatebenefratelli S Pietro Hosp, Div Neurol, Rome, Italy

[4] Univ Helsinki, Cent Hosp, Dept Clin Neurophysiol, FIN-00290 Helsinki, Finland

来源：

NEUROIMAGE | 2001年 / 13卷 / 04期

基金：

芬兰科学院;

关键词：

brain rhythm; magnetoencephalography; evoked responses; man; somatosensory cortex; repetition rate;

D O I：

10.1006/nimg.2000.0725

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

Electrical activity of the human brain features several rhythmical components which can be readily studied with whole-scalp neuromagnetometers. We de scribe a new 7- to 9-Hz "sigma" rhythm in the human second somatosensory cortex, distinct from both the mu rhythm of the primary sensorimotor cortex and the tau rhythm of the supratemporal auditory cortex. Sigma shows rate-selective responsiveness to rhythmical median nerve stimulation and is enhanced by stimulation at the rhythm's dominant frequency. Single stimuli may trigger several periods of the rhythm. The functional significance of the sigma rhythm remains to be investigated. (C) 2001 Academic Press.

引用

页码：662 / 668

页数：7

共 25 条

[11] Significance of the second somatosensory cortex in sensorimotor integration: Enhancement of sensory responses during finger movements [J].