Abstract

Publisher Summary This chapter discusses findings that were obtained during the course of electrocorticographic conditioning in 16 human subjects who were treated with adrenocorticotropic hormone (ACTH) and ACTH fragments. Regarding the effect of corticosteroids on central nervous processes, it was suggested that they facilitate internal inhibition and that such an action is mediated via descending inhibitory influence of the basal forebrain that plays a basic role in the control of sensory input into the diencephalon. The synchronization of electroencephalographic (EEG) activity, or the enhancement of alpha rhythm, is a common phenomenon during differential conditioning as a response to the differential signal and during the course of the extinction of conditioned reflex activity. Both ACTH and corticosteroid treatment resulted in an increased convulsive reactivity, a slowing of the EEG activity, and an increased sensitivity to hyperventilation and photic driving in human subjects. The subjects were hospitalized for reason of minor neurological symptoms during the whole observation period.

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