Reversal learning with singly presented stimuli in pigeons and goldfish

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Studied the performance of 8 white carneaux cocks and 13 goldfish in a series of discrete-trial 2-day red-green discrimination reversals in which the stimuli were presented singly and time of response to each was measured. Progressive improvement was found in both groups, but took different forms. In the pigeons, there was a decline over reversals in the stability of inhibition between sessions and an increase in the rate at which inhibition developed within sessions. In the goldfish, there was some decrement in the stability of excitation as well as of inhibition, and no change in the rate of discrimination, but only an overall increase in time of response to both stimuli which was greater for the negative than for the positive. Results are compared with those obtained in choice experiments. (18 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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