Accession Number : AD0668502

Title :   GANGLION CELL RESPONSE CHARACTERISTICS FROM THE AREA CENTRALIS IN THE INTACT EYE OF THE CAT.

Descriptive Note : Army-Navy Joint rept.,

Corporate Author : NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA

Personal Author(s) : Steinberg,Roy H.

Report Date : 14 FEB 1968

Pagination or Media Count : 45

Abstract : Ganglion cell responses were recorded with microelectrodes from the intact eye to focused spots and annuli of light delivered by a dual-beam ophthalmoscope. Only concentrically organized circular receptive fields were analysed. Thresholds for optimal center and surround stimuli were approximately equal, as were the latencies of on-responses from the center and surround. With whole-field stimulation center-dominance was a function of light intensity. Off-responses and center-surround interaction were observed with brief flashes (5 msec, 10 msec). With increases of flash duration the duration of the on-response did not increase by the full increment of the flash until the flashes were 50 to 80 msec. At high-flash intensities the on-response extended into the off-period and the off-response weakened and disappeared; it occurred with both on-excitation and on-inhibition and for the responses of both center and surround. These intensity effects were also studied in an intracellular recording; at high intensities, the rate of repolarization of the postsynaptic potential decreased, and the latency of repolarization was delayed. (Author)

Descriptors :   (*GANGLIA, RETINA), ELECTRORETINOGRAPHY, EYE, AFTERIMAGES, STIMULATION(PHYSIOLOGY), THRESHOLDS(PHYSIOLOGY), RESPONSE(BIOLOGY), ILLUMINATION, INTENSITY

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE