Behavior of the turtle (Chrysemys picta picta) in simultaneous, successive, and behavioral contrast situations

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4 experiments on reward and learning in a total of 99 painted turtles yielded the following patterns of results: negative simultaneous contrast, positive behavioral contrast, a positive relation between magnitude of reward and resistance to extinction, and a gradual decrement in performance as a function of abrupt reduction in magnitude of reward, but no suggestion of negative successive contrast. This pattern is the same as that of analogous experiments with fish and quite different from that of analogous experiments with rats. Its bearing on the interrelatins among the various contrast phenomena and on the problem of phyletic differences in learning is discussed. (39 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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