Accession Number:

AD0730192

Title:

Evoked Responses in the Auditory Cortex of the Cat to Sounds from Different Directions. Part II. Quantitative Characteristics,

Descriptive Note:

Corporate Author:

SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX

Personal Author(s):

Report Date:

1971-01-01

Pagination or Media Count:

12.0

Abstract:

The summary evoked potentials in the auditory cortex AI of the narcotized cat differ in their quantitative characteristics depending on the side of monaural auditory stimulus. When the contralateral ear is stimulated, the latent periods of the various phases of the EP and the duration of its positive phase are shorter, the amplitude is higher and the thresholds of development of its individual components are lower than with stimulus of the ipsilateral ear by a sound of equal superthreshold intensity. The amplitudes and latent periods of the associative responses, tapped at the suprasylvian gyrus, show the same dependence on the ear to which the signal is applied. These differences in EP parameters indicate higher excitability of the elements which form it with contralateral stimulation the participation of a larger number of such elements in this reaction, and their earlier synchronous involvement. It can be assumed that the difference in the characteristics of responses to monaural signals of various directions are superimposed on the binaural effect with binaural interactions, reenforcing it and may therefore facilitate in distinguishing the direction of a source of sound. Author

Subject Categories:

  • Psychology
  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE