Maps of somatosensory evoked potentials (SEPs) to mechanical (tapping) stimuli: comparison with P14, N20, P22, N30 of electrically elicited SEPs.
Bit mapped color imaging of SEPs was recorded from 19 derivations in 11 healthy volunteers after electrical stimulation of the median nerve at the wrist, index finger digital nerve stimulation, and mechanical stimulation of the index fingertips by an electromechanically driven vibrating thin metallic plate. The latencies of SEP components increased for the various stimulation modalities, being shortest after median nerve stimulation at the wrist and longest after mechanical stimulation of the index fingertips. The scalp distribution of SEPs to mechanical stimuli was, however, the same as other SEPs, independently of the stimulation employed, and components corresponding to N20 and P22 were recorded only contralaterally to the stimulated side.
Onofrj
M
M
Department of Neurology, University of Chieti, Italy.
Basciani
M
M
Fulgente
T
T
Bazzano
S
S
Malatesta
G
G
Curatola
L
L
D000328:Adult; D001931:Brain Mapping; D004558:Electric Stimulation; D005073:Evoked Potentials, Somatosensory; D005260:Female; D005385:Fingers / Q000502:physiology; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000502:physiology; D008875:Middle Aged; D010812:Physical Stimulation; D011930:Reaction Time