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- W2056221474 abstract "A magnitude effect in human intertemporal choice is well established-larger rewards or outcomes are discounted over time at a lower rate than are smaller rewards. However, many recent studies have failed to find a corresponding effect in nonhuman animals. Here we report a magnitude effect in temporal discounting for pigeons' choices involving a tradeoff between reward delay and amount. Pigeons chose between a small reward (1-s access to food) after a 2-s delay, and a large reward (4.5-s access to food) after a 28-s delay. Across conditions, the delays to the small and large rewards were increased or decreased, respectively. Temporal discounting functions obtained through a value-estimation procedure showed clear evidence of a magnitude effect: The value of the large reward decreased more slowly with increasing delay than the value of the small reward. We linked this result to a nonlinear relationship between choice and the delays associated with the small and large rewards. The nonlinearity was contrary to the generalized matching law but was predicted by the contextual choice model. Our results confirm the existence of a magnitude effect in nonhuman temporal discounting, showing that this adaptation is not unique to humans." @default.
- W2056221474 created "2016-06-24" @default.
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- W2056221474 creator A5074647979 @default.
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- W2056221474 date "2012-01-01" @default.
- W2056221474 modified "2023-10-10" @default.
- W2056221474 title "Evidence for a magnitude effect in temporal discounting with pigeons." @default.
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- W2056221474 doi "https://doi.org/10.1037/a0026345" @default.
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