Temporal Discrimination in Pigeons

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Science  26 Jan 1962:
Vol. 135, Issue 3500, pp. 314-315
DOI: 10.1126/science.135.3500.314


Pigeons trained to peck a lighted key were presented with a key that was alternately dark and lighted. The key was dark for intervals of from 3 to 30 seconds. Pecking of the lighted key was reinforced only after the shortest or, in a second experiment, the longest interval that the key was dark. The pigeons were able to discriminate the duration of the dark interval.