Contrasting behavior of beta event-related synchronization and somatosensory evoked potential after median nerve stimulation during finger manipulation in man.
Electrical median nerve stimulation during rest results in two cortical responses: the somatosensory evoked potential (SEP); and the induced beta oscillations (beta event-related synchronization (ERS)). Both types of responses were recorded with electroencephalography and studied during rest and motor behavior in eight normal subjects. During manipulation of a cube with the fingers of the right hand, the beta ERS around 20 Hz, induced by right hand median nerve stimulation, is significantly suppressed, whereas the long-latency SEP components are significantly enhanced. The results suggest that both phenomena can be interpreted as responses of different neuronal structures in sensorimotor areas.
Pfurtscheller
G
G
Department of Medical Informatics, Institute of Biomedical Engineering, University of Technology Graz, Inffeldgasse 16a, A-8010 Graz, Austria. pfurtscheller@dpmi.tu-graz.ac.at
Woertz
M
M
Müller
G
G
Wriessnegger
S
S
Pfurtscheller
K
K
D000328:Adult; D001611:Beta Rhythm / Q000379:methods* / Q000706:statistics & numerical data; D003344:Cortical Synchronization / Q000379:methods / Q000706:statistics & numerical data; D004558:Electric Stimulation / Q000379:methods; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005260:Female; D005385:Fingers / Q000502:physiology*; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000502:physiology*; D009043:Motor Activity / Q000502:physiology