Summary
Macaque monkeys were trained to fall asleep while sitting in a primate chair with their heads restrained. A gentle vibratory stimulus was delivered to the glabrous skin of the hand; it did not provoke awakening or change the sleep cycle of the macaque. Postcentral neuronal response to the amplitude of a sine wave mechanical stimulus and neuronal spontaneous activity were observed repetitively during all the phases of normal night sleep cycles. One hundred six neurons which could be entrained by a cutaneous mechanical stimulus were studied during both waking and sleep. At threshold, cyclic entrainment of the discharges of postcentral neurons decreased to 81±0.25% during light sleep (S1+S2), to 64±0.26% during deep sleep (S3+S4), and to 9±0.98% during desynchronized sleep with rapid eye movements (REMs).
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Supported by N.I.H. No. 1F11 NS 02693-01 NSRA
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Gücer, G. The effect of sleep upon the transmission of afferent activity in the somatic afferent system. Exp Brain Res 34, 287–298 (1979). https://doi.org/10.1007/BF00235674
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DOI: https://doi.org/10.1007/BF00235674