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Abstract
Epidural and cortical mapping of somatosensory evoked activity after mediannerve stimulation was performed under barbiturate anaesthesia in 6 cats. Depth profiles were made to confirm the site of the cortical generators. The area studied revealed two cortical generators in SI and one in SII. In all cases polarity changes in intracortical tracks were demonstrated. The peak latency of all these generators was 12 msec. In SI a P 8 was also a consistent finding in epidural, epicortical and intracortical measurements. No evidence, however, could be obtained for a cortical origin of the P 8. The most rostral generator of the P 12 was localized in the posterior sigmoid gyrus (area 3a). The N 12 originates from the dorso-medial bank of the coronal sulcus in SI (area 2). Histological evidence for these projections was obtained with use of electrode markation. Within the second somatosensory area one source was active; the P 12 originated just lateral to the anterior aspect of the suprasylvian sulcus in the anterior ectosylvian gyrus.
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