MacDonall James S
Department of Psychology, Fordham University, 441 East Fordham Road, Bronx, NY 10458, United States.
Behav Processes. 2008 Jun;78(2):173-84. doi: 10.1016/j.beproc.2008.03.002. Epub 2008 Mar 21.
The stay/switch model is an alternative to the generalized matching law for describing choice in concurrent procedures. The purpose of the present experiment was to extend this model to choice among magnitudes of reinforcers. Rats were exposed to conditions in which the magnitude of reinforcers (number of food pellets) varied for staying at alternative 1, switching from alternative 1, staying at alternative 2 and switching from alternative 2. A changeover delay was not used. The results showed that the stay/switch model provided a good account of the data overall, and deviations from fits of the generalized matching law to response allocation data were in the direction predicted by the stay/switch model. In addition, comparisons among specific conditions suggested that varying the ratio of obtained reinforcers, as in the generalized matching law, was not necessary to change the response and time allocations. Other comparisons suggested that varying the ratio of obtained reinforcers was not sufficient to change response allocation. Taken together these results provide additional support for the stay/switch model of concurrent choice.
停留/转换模型是用于描述并发程序中选择行为的广义匹配法则的一种替代模型。本实验的目的是将该模型扩展到强化物数量级之间的选择。大鼠被置于这样的条件下：强化物的数量级（食物颗粒数）在停留于选项1、从选项1转换、停留于选项2以及从选项2转换时有所不同。实验未使用转换延迟。结果表明，停留/转换模型总体上能很好地解释数据，并且广义匹配法则对反应分配数据的拟合偏差方向与停留/转换模型所预测的一致。此外，特定条件之间的比较表明，与广义匹配法则一样，改变获得的强化物比例并非改变反应和时间分配所必需。其他比较表明，改变获得的强化物比例不足以改变反应分配。综合这些结果为并发选择的停留/转换模型提供了更多支持。
