Accession Number : AD0447461

Title :   EVOKED RESPONSES FROM THE AUDITORY CORTEX,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : Teas, Donald C. ; Kiang, Nelson Y. S.

Report Date : 14 FEB 1964

Pagination or Media Count : 8

Abstract : Evoked responses w re recorded from the auditory cortex of unanesthetized cats. With clicks of moderate intensity, the waveforms of the responses were highly repeatable among awake cats. Introduction of certain variables such as localized injury to cortex, anesthesia, or sleep resulted in more or less characteristic changes in the waveform of the evoked responses. In particular, the later components of the responses seemed to be more sensitive to changes in the state of the animal, while the early components seemed to be abolished by local injury to the cortex. The evoked responses and particularly the later components did not always behave in a reliably repeatable fashion as click intensity or click rate was changed. When broad-band background noise was introduced, the click evoked responses always showed a characteristic decrease in the earliest component. The later components were not substantially affected until the noise was raised to an intensity that was sufficient to mask the click for a listener. These results are interpreted in terms of multiple projection pathways to cortex with possible functional significance. (Author)

Descriptors :   *AUDITORY NERVE, PHYSIOLOGY, CATS, BEHAVIOR, REACTION(PSYCHOLOGY), INTENSITY, STIMULATION(PHYSIOLOGY), BRAIN, NEUROLOGY, SLEEP, SURGERY.

Distribution Statement : APPROVED FOR PUBLIC RELEASE