Prospective and retrospective timing by pigeons.
Pigeons discriminated between two pairs of durations: a short set (2.5 and 5 sec) and a long set (5 and 10 sec). The pairs were intermixed within sessions and identified by the colors on the signal and choice keys. Once the task was learned, the pigeons experienced the following three conditions seriatim: (1) The signal key was made ambiguous about the test change, but the choice keys were informative (retrospective); (2) the signal key identified the test range, but the choice keys did not (prospective); (3) probe trials were introduced in which the color of the center key signaled one test range, but the color of the choice keys signaled the other test range (inconsistent). Accuracy of choice decreased in the retrospective condition and, returned to baseline levels, was higher under the prospective condition than under the retrospective condition. In a final condition, referred to as conflict trials, the center-key color signified one test range and the choice-key colors the other range. The results from these conflict-inconsistent tests indicate that choice behavior was largely controlled by the signal-key color and not by the choice-key color. We relate these findings to different approaches to timing in animals.
Fetterman
J Gregor
JG
Indiana University-Purdue University, Indianapolis, Indiana 46202, USA. gfetter@iupui.edu
Killeen
P Richard
PR
D000818:Animals; D001245:Association Learning; D002755:Choice Behavior; D003118:Color Perception; D010856:Columbidae; D003463:Cues; D004193:Discrimination Learning; D008297:Male; D008570:Memory, Short-Term; D011337:Probability Learning; D012055:Reinforcement Schedule; D013998:Time Perception
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