Accession Number : AD0693041

Title :   THE ROD AFTER-EFFECT IN S-POTENTIALS FROM CAT RETINA.

Descriptive Note : Joint rept.,

Corporate Author : NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA

Personal Author(s) : Steinberg,Roy H.

Report Date : 18 JUN 1969

Pagination or Media Count : 18

Abstract : The relation of the rod after-effect to percentage rhodopsin bleached was studied in S-potentials from cat retina. At threshold, flashes which produced the rod after-effect bleached only very small quantities of rhodopsin; and at a fixed flash duration, the duration of the after-effect increased as a function of log intensity. The after-effect's threshold occurred at about the intensity which saturated the maintained voltage. With flash intensity fixed (6.5 log td. scotopic) and flash duration increased (0.5 to 64.0 sec) the duration of the after-effect was a linear function of exposure time. The duration continued to increase after an exposure of 16 sec, even though at least 99 per cent of the rhodopsin had been bleached. It is concluded that the after-effect originates from something which accumulates after the maintained voltage in rod pathways reaches a ceiling. The accumulation can continue at a fixed rate irrespective of the bleaching rate. (Author)

Descriptors :   (*RETINA, RESPONSE(BIOLOGY)), ELECTROPHYSIOLOGY, LIGHT, VISION, VOLTAGE, INTENSITY, CATS, ADAPTATION(PHYSIOLOGY), NERVE IMPULSES

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE