Timing and spatial distribution of somatosensory responses recorded in the upper bank of the sylvian fissure (SII area) in humans |
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Authors: | Frot M Mauguière F |
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Affiliation: | Functional Neurology and Epileptology Department, H?pital Neurologique, Lyon, France. |
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Abstract: | We studied responses of the parieto-frontal opercular cortex to electric stimuli, as recorded by intra-cortical electrodes during stereotactic EEG presurgical assessment of patients with drug-resistant temporal lobe epilepsy. After electrical stimulation of the median nerve at the wrist, we consistently recorded a negative-positive biphasic response peaking at 60 ms (N60) and 90 ms (P90) post-stimulus in the upper bank of the sylvian fissure contralateral to stimulation. Talairach stereotactic coordinates of the electrode contacts recording these responses covered the pre- and post-rolandic part of the upper bank of the sylvian fissure (25
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