GANGLION CELL RESPONSE CHARACTERISTICS FROM THE AREA CENTRALIS IN THE INTACT EYE OF THE CAT.
Army-Navy Joint rept.,
NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA
Pagination or Media Count:
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
- Anatomy and Physiology