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Somatosensory evoked potentials (SEP) are attenuated following double electrical stimulation of the fingers (II + III). This effect is observed at cervical (N13), parietal (N20-P27) and frontal (P22-N30) levels. We simultaneously observed in the same subjects that cutaneous perception of the test-shock is completely suppressed with interstimulus intervals (ISI) within a 0-10 msec range. With 25-30 msec ISI, the perceptive function totally recovers, but SEP inhibition remains at 50 % of the control. The SEP reduction does not result in a perception deficit as long as the cortical-test response exceeds 50% of control. These results suggest that: SEP inhibition could be a local but durable phenomenon occurring at both cervical and cortical levels. Cutaneous perception does not necessitate a maximal SEP development. The perceptive process involves other associative areas (5,7...) and is activated when the primary cortical activation exceeds a certain threshold which was found at 50% of the unconditioned response voltage.
M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
M Hugon, and
F Mauguière
February 1995,
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M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
M Hugon, and
F Mauguière
July 1967,
Electroencephalography and clinical neurophysiology,
M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
M Hugon, and
F Mauguière
July 1966,
Archives of neurology,
M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
M Hugon, and
F Mauguière
December 1981,
Electroencephalography and clinical neurophysiology,
M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
M Hugon, and
F Mauguière
January 1975,
International anesthesiology clinics,
M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
M Hugon, and
F Mauguière
December 1967,
Electroencephalography and clinical neurophysiology,
M el Kharroussi, and
V Ibanez, and
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F Mauguière
March 1986,
Electroencephalography and clinical neurophysiology,
M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
M Hugon, and
F Mauguière
January 1985,
Nihon seirigaku zasshi. Journal of the Physiological Society of Japan,
M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
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F Mauguière
November 1976,
Electroencephalography and clinical neurophysiology,
M el Kharroussi, and
V Ibanez, and
W Ben Jelloun, and
M Hugon, and
F Mauguière
May 1976,
Electroencephalography and clinical neurophysiology,
