Abstract
Common crows and pigeons were studied successively under variable-interval, variable-time, and extinction schedules. The rate and pattern of keypecking were similar for both species under the variable-interval schedule. While overall response rates did not differ between species under the variable-time schedule, there were major differences in the intrasession and interreinforcement distribution of responses. During the final sessions under this procedure, the crows showed marked within-session attenuation of responding, whereas the pigeons responded consistently throughout the sessions. The second difference, which appeared to be related to the first, involved the frequent occurrence of keypecks in pigeons that were directly elicited by food presentations. The crows never displayed this form of behavior. There was no difference between species in responding under extinction.
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Powell, R.W., Palm, L.J. Responding under variable-interval, variable-time, and extinction schedules in pigeons and crows. Bull. Psychon. Soc. 19, 55–58 (1982). https://doi.org/10.3758/BF03330038
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DOI: https://doi.org/10.3758/BF03330038