Serial discrimination reversal learning in pigeons as a function of intertrial interval and delay of reinforcement.
Pigeons learned a series of reversals of a simultaneous red-green visual discrimination. Delay of reinforcement (0 vs. 2 sec) and intertrial interval (ITI; 4 vs. 40 sec) were varied across blocks of reversals. Learning was faster with 0-sec than with 2-sec delays for both ITI values and faster with 4-sec ITIs than with 40-sec ITIs for both delays. Improvement in learning across successive reversals was evident throughout the experiment, furthermore, even after more than 120 reversals. The potent effects of small differences in reinforcement delay provide evidence for associative accounts and appear to be incompatible with accounts of choice that attempt to encompass the effects of temporal parameters in terms of animals' timing of temporal intervals.
Ploog
Bertram O
BO
Department of Psychology, College of Staten Island, City University of New York, 2800 Victory Blvd., Staten Island, NY 10314, USA. bertram.ploog@csi.cuny.edu
Williams
Ben A
BA
D000704:Analysis of Variance; D000818:Animals; D001288:Attention / Q000502:physiology; D003118:Color Perception / Q000502:physiology; D010856:Columbidae; D004193:Discrimination Learning / Q000502:physiology*; D012055:Reinforcement Schedule; D012054:Reinforcement, Psychology; D012193:Reversal Learning / Q000502:physiology*; D012691:Serial Learning / Q000502:physiology*; D013997:Time Factors