Accession Number : AD0681207

Title :   THE EFFECT OF ATTENTION ON AUDITORY EVOKED POTENTIALS.

Descriptive Note : Technical memo.,

Corporate Author : HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Oatman,Lynn C.

Report Date : OCT 1968

Pagination or Media Count : 45

Abstract : Click-evoked potentials were recorded from unanesthetized cats with electrodes chronically implanted in the auditory cortex, cochlear nucleus, and round window. The clicks (irrelevant stimuli) were presented continuously as background before, during, and after the presentation of a visual discrimination task (relevant stimuli) which attempted to alter the attentive state of the animals. The mean peak-to-peak amplitudes of averaged click-evoked responses from six adult female cats were significantly smaller during attention to the visual discrimination stimuli when compared with the pre-discrimination and control periods. This relationship was present at all electrode placements for five experimental animals with middle ear muscles cut as well as one control animal with middle ear muscles intact. The results suggest that during attention, a central inhibitory mechanism, independent of middle ear muscles, modifies click-evoked responses possibly via the olivo-cochlear bundle which terminates on the hair cells in the cochlea. (Author)

Descriptors :   (*ATTENTION, AUDITORY SIGNALS), (*AUDITORY SIGNALS, RESPONSE(BIOLOGY)), ELECTRODES, HUMAN FACTORS ENGINEERING, PERCEPTION, NERVE IMPULSES, ELECTROPHYSIOLOGY, NERVOUS SYSTEM, NEUROMUSCULAR TRANSMISSION, INHIBITION, VOLTAGE, STIMULATION(PHYSIOLOGY), SURGICAL IMPLANTATION, VISION, THRESHOLDS(PHYSIOLOGY), EAR, MUSCLES, CATS

Subject Categories : Psychology
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE