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  • Title: High-frequency SEP components generated in the somatosensory cortex of the monkey.
    Author: Shimazu H, Kaji R, Tsujimoto T, Kohara N, Ikeda A, Kimura J, Shibasaki H.
    Journal: Neuroreport; 2000 Aug 21; 11(12):2821-6. PubMed ID: 10976970.
    Abstract:
    To investigate the origin of high-frequency somatosensory evoked potential (SEP) components, we recorded median nerve SEPs from the scalp and the depth in six monkeys. Laminar field potentials were analyzed in area 3b (N10; corresponding to human N20) and area 1 (P12; corresponding to human P25). After digital filtering (300-900 Hz), 4-6 components were identified, and the 1st to 4th peaks in area 3b (7-11 ms in latency) and the 3rd to 5th in area 1 (9-13 ms) showed clear polarity reversals between the surface and the depth of the cortex. These results provide direct evidence for intracortical origin of early high-frequency components in area 3b and of late ones in area 1.
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