Differential effect of task relevance on early and late components of cortical and subcortical somatic evoked potentials in man

Electroencephalography and Clinical Neurophysiology
M Velasco, F Velasco

Abstract

The effect of "task relevance" on early and late components of cortical and subcortical somatic evoked potentials (SEPs) was studied in a group of Parkinsonian patients operated on under local anesthesia for treatment of prominent unilateral tremor. 1. SEPs produced by median nerve stimulation were found at contralateral cortical (ss), thalamic (vcpci, vcai), lemniscal (Lm), postilemniscal (PoLm), prelemniscal (Raprl) and reticular (Ttc) regions. No SEPs were found in other contiguous thalamic (M,Pf, ce) and subthalamic (Q) regions. 2. Subcortical early SEP components consisted of two monophasic positive potentials distributed within a circumscribed thalamo-lemniscal region where electrical stimulation elicited consistent sensory responses circumscribed to contralateral hand and face. In contrast, subcortical late SEP components consisted of monophasic or polyphasic, positive or negative potentials distributed in a widespread, thalamic, lemniscal, prelemniscal and reticular region where elecrical stimulation elecited sensory or motor responses of various types. Subcortical early and late SEP components appeared together in lemniscal, thalamic and cortical regions but they wers separated at postlemniscal (only early) and prelemn...Continue Reading

References

Aug 1, 1975·Electroencephalography and Clinical Neurophysiology·M VelascoJ P Machado
Mar 1, 1967·Electroencephalography and Clinical Neurophysiology·L BergaminiR Mutani
Jun 1, 1970·Electroencephalography and Clinical Neurophysiology·P D WilliamsonT Allison
Feb 1, 1972·Journal of Neurosurgery·F C VelascoJ Hardy
Feb 1, 1973·Journal of Neurosurgery·F Velasco, P Molina-Negro
Feb 1, 1973·Neuropharmacology·F Velasco, M Velasco
May 1, 1972·Neuropharmacology·M VelascoD González-Bárcena
Aug 1, 1969·Journal of Neurosurgery·P E Stohr, S Goldring
Jun 1, 1962·Electroencephalography and Clinical Neurophysiology·T ALLISON

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Citations

Aug 1, 1975·Electroencephalography and Clinical Neurophysiology·M VelascoJ P Machado
Feb 1, 1978·Electroencephalography and Clinical Neurophysiology·E G LewisE C Beck
Aug 1, 1979·Electroencephalography and Clinical Neurophysiology·M VelascoC Cepeda
Jan 1, 1980·Electroencephalography and Clinical Neurophysiology·F VelascoH Muñoz
Apr 1, 1980·Electroencephalography and Clinical Neurophysiology·M VelascoA Olvera
Jul 1, 1980·Electroencephalography and Clinical Neurophysiology·J A ObesoN Carrera
Apr 1, 1982·Electroencephalography and Clinical Neurophysiology·D BurkeN F Skuse
Jan 1, 1989·Electroencephalography and Clinical Neurophysiology·R Dowman, J R Wolpaw
Feb 1, 1990·Biological Psychology·L O Bauer, R L Bayles
Nov 1, 1981·Journal of Neurosurgery·B ChehraziR Bucholz
Jun 1, 1979·Experimental Neurology·F VelascoH Maldonado
Apr 1, 1989·The International Journal of Neuroscience·A C PapanicolaouH E Gary
Oct 1, 1984·The International Journal of Neuroscience·A C Papanicolaou, J Johnstone
Oct 1, 1981·Clinical EEG (electroencephalography)·M RappaportT Belleza

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