Abstract
Rats experienced shifts in reward magnitude after 24, 54, or 108 trials to the first reward magnitude. All Ss were run in a two-way runway situation with six trials every day. As days of preshift training increased, the number of trials before postshift performance shifts occurred also increased. Since Ss with extended training and only one directional response do not take a long time to shift response rate (Crespi, 1942), the present results were related to the two responses that were required.
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