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  • Title: Two evoked responses with different recovery functions in the primary somatosensory cortex in humans.
    Author: Hoshiyama M, Kakigi R.
    Journal: Clin Neurophysiol; 2001 Jul; 112(7):1334-42. PubMed ID: 11516746.
    Abstract:
    OBJECTIVES: We investigated the recovery function of somatosensory evoked magnetic cortical fields (SEFs) to confirm the temporal aspects of the somatosensory process in humans. METHODS: SEFs were recorded following median nerve electrical stimulation in 6 healthy subjects. Double stimulation, with interstimulus intervals (ISIs) from 3 to 100 ms, was applied, and the SEF components for the second stimulation were analyzed. In a supplementary experiment, responses to single stimulations of various intensities from the sensory threshold to the motor threshold were studied. RESULTS: The first SEF component (1M) diminished when the ISI was less than 10 ms, while the second component (2M) remained even when the ISI was 3 ms. The two components showed a very similar attenuation with decrease of stimulus intensity. There was no significant difference in dipole location between 1M and 2M in the primary somatosensory cortex (SI). CONCLUSIONS: The results suggested that at least two independent pathways with different recovery functions exist in a similar area in the SI.
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