Accession Number : AD0665453

Title :   A MODEL FOR CONTINUOUS NEUROELECTRIC ACTIVITY: THE ENCODING OF STIMULUS INTENSITY,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : MacGregor,R. J.

Report Date : FEB 1968

Pagination or Media Count : 35

Abstract : The work applies the idea of large-amplitude depolarizations in dendritic regions to the intensity dependence of graded potentials in the vertebrate retina. The model assumes that membrane in dendritic regions of primary afferents is linear, that receptors excite primary afferents by a synaptic mechanism which is continuously active during stimulation, and that the magnitude of the permeability change depends linearly upon stimulus intensity. Comparison of the results with electrical data suggests that such a synaptic mechanism might represent the source of logarithmic intensity encoding. Psychophysical intensity data and possible applicability to other sensory modes are briefly discussed. (Author)

Descriptors :   (*BIONICS, RETINA), (*RETINA, ELECTROPHYSIOLOGY), MATHEMATICAL MODELS, COLOR VISION, PHOTORECEPTORS, NERVOUS SYSTEM, NERVE IMPULSES, VERTEBRATES, STIMULATION(PHYSIOLOGY), PSYCHOPHYSICS, VISION

Subject Categories : Bionics

Distribution Statement : APPROVED FOR PUBLIC RELEASE