INTERACTION BETWEEN AFFERENT AND CORTICALLY INDUCED RETICULAR RESPONSES

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Abstract
Interaction occurring between afferent (from sciatic and infraorbital nerves) and cortically evoked reticular potentials as well as unitary analysis of reticular neurons indicate an extensive but not complete overlapping of reticulopetal pathways. This interaction was shown to be both of blocking and of facilita. tory nature, the blocking effect evidently being due to occlusion and refractoriness of reticular neurones while the facilitation is caused by summation in the subliminal fringe. Occlusion and refractoriness also accounts for a long-lasting depression of afferent responses in the reticular formation following cortical, subcortical or peripheral repetitive stimulation. Repetitive cortical and reticular stimulation causes depression of an afferent test volley in the sensory trigeminal nucleus. Such a central influence upon specific sensory relays may be partly responsible for the cortically induced depression of afferent reticular responses.

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