Light-dependent synaptic delay between photoreceptors and horizontal cells in the tiger salamander retina.
A long delay between the time to peak of the photoreceptor and horizontal cell light responses was observed in dark-adapted tiger salamander retinas. The rise of the HC light responses follows a biphasic time-course which is probably mediated by the removal of the rod and cone transmitters, but not by voltage-dependent mechanisms in the HC membrane. A bleaching white light shortens the signal delay and results in a faster and monophasic rise of the HC light responses mediated predominantly by the cones.
Wu
S M
SM
Cullen Eye Institute, Baylor College of Medicine, Houston, TX 77030.
D000200:Action Potentials; D000818:Animals; D003623:Dark Adaptation; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology*; D012160:Retina / Q000502:physiology*; D013569:Synapses / Q000502:physiology; D009435:Synaptic Transmission; D013997:Time Factors; D014562:Caudata