Do adjusting-amount and adjusting-delay procedures produce equivalent estimates of subjective value in pigeons?
Do adjusting-amount and adjusting-delay procedures produce equivalent estimates of subjective value in pigeons?
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DOI：
10.1901/jeab.2007.37-06
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发表时间：
2007-05-01
影响因子：
2.7
通讯作者：
Holt, Daniel D.
中科院分区：
文献类型：
--
作者：
Green, Leonard;Myerson, Joel;Holt, Daniel D.
目前的实验检验了调整金额和调整延迟程序是否提供了等同的贴现措施。鸽子在两种方法上的折扣是使用受试者内的轭技术进行比较的，在这种方法中，一种方法获得的无差异点(弹丸数量或强化之前的时间)确定了与另一种方法在轭条件下的相应变量的值。每个过程的行为都可以用双曲线贴现函数来很好地描述。结果表明，在使用20毫克颗粒的实验1中，通过双曲线的贴现率参数衡量的折扣程度没有系统性差异。在实验2中，使用14毫克的较小颗粒重复了这些结果，这可能会产生更精确的调整量过程中无差别点的测量。通过一种方法获得的双曲贴现函数中k参数的估计与用另一种方法从相同受试者获得的估计没有系统地不同，这一发现有力地支持了这样一种假设，即相同的过程是调整数额和调整延迟过程中延迟报酬的贴现的基础。
The current experiment examined whether adjusting-amount and adjusting-delay procedures provide equivalent measures of discounting. Pigeons' discounting on the two procedures was compared using a within-subject yoking technique in which the indifference point (number of pellets or time until reinforcement) obtained with one procedure determined the value of the corresponding variable in the yoked condition with the other procedure. Behavior on each procedure was well described by a hyperbolic discounting function. Results revealed no systematic differences in the degree of discounting as measured by the discounting rate parameter of the hyperbola in Experiment 1, which used 20-mg pellets. These results were replicated in Experiment 2 using smaller, 14-mg pellets, which potentially yield more precise measurement of indifference points on the adjusting-amount procedure. The finding that estimates of the k parameter in the hyperbolic discounting function obtained with one procedure did not differ systematically from estimates obtained from the same subjects with the other procedure represents strong support for the hypothesis that the same process underlies the discounting of delayed rewards on both adjusting-amount and adjusting-delay procedures.