Evidence for a 7- to 9-Hz "sigma" rhythm in the human SII cortex.
Neuroimage
; 13(4): 662-8, 2001 Apr.
Article
em En
| MEDLINE
| ID: mdl-11305895
ABSTRACT
Electrical activity of the human brain features several rhythmical components which can be readily studied with whole-scalp neuromagnetometers. We describe 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.
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Base de dados:
MEDLINE
Assunto principal:
Periodicidade
/
Córtex Somatossensorial
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article