THE SHORT AND LONG-TERM EFFECTS OF TEMPERATURE ON THE DYNAMIC-RANGE OF SIGNALING IN HORIZONTAL CELLS OF CARP RETINA

1. Intracellular recordings of luminosity horizontal cell responses were made from retinas isolated from carp (Cyprinus carpio) acclimated for at least three weeks to temperatures of 8, 16 and 26 degrees C. 2. Changing the temperature of the isolated retina resulted in an increase in the rate of rise and fall phases of horizontal responses and a reduction of response latency as temperature increased. 3. The maximum amplitudes (V-max) of horizontal cell responses were reduced for low and high temperatures with a small, intermediate range over which the largest values of V-max were recorded. 4. The range of temperatures for which V-max was maximum was found to be dependent on the temperature of acclimation in an adaptive manner.