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The origins of short‐latency somatosensory evoked potentials in humans
Author(s) -
Mauguière F.,
Courjon J.
Publication year - 1981
Publication title -
annals of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.764
H-Index - 296
eISSN - 1531-8249
pISSN - 0364-5134
DOI - 10.1002/ana.410090616
Subject(s) - somatosensory evoked potential , scalp , somatosensory system , neuroscience , medulla , spinothalamic tract , stimulation , medicine , dorsum , electrophysiology , latency (audio) , spinal cord , anatomy , psychology , nociception , receptor , engineering , electrical engineering
Short‐latency somatosensory evoked potentials (SEPs) to median nerve stimulation were studied in three patients with well‐localized lesions of the lemniscal pathways. In two patients who had focal thalamic vascular lesions, the early scalp‐recorded P15 far‐field potential was unaltered while later SEP components were absent. In the third patient, operated on for astrocytoma of the dorsal medulla and right dorsal funiculus, the P15 potential was absent but the earlier negative potentials recorded from the neck persisted whichever side was stimulated. The data suggest a subthalamic origin for the scalp‐recorded P15 far‐field potential.