Pigeons were presented with a concurrent-chains schedule in which the total time to primary reinforcement was equated for the two alternatives (VI 30 s VI 60 s vs. VI 60 s VI 30 s). In one set of conditions, the terminal links were signaled by the same stimulus, and in another set of conditions they were signaled by different stimuli. Choice was in favor of the shorter terminal link when the terminal links were differentially signaled but in favor of the shorter initial link (and longer terminal link) when the terminal links shared the same stimulus. Preference reversed regularly with reversals of the stimulus condition and was unrelated to the discrimination between the two terminal links during the nondifferential stimulus condition. The present results suggest that the relative value of the terminal-link stimuli and the relative rate of conditioned reinforcer presentation are important influences on choice behavior, and that models of conditioned reinforcement need to include both factors.
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机译：鸽子采用并发链计划，其中两种替代选择的总强化时间相等（VI 30 VI 60和VI 60 VI 30）。在一组条件下，终端链路通过相同的刺激信号发出，而在另一组条件下，终端链路通过不同的刺激信号发出。当终端链路被差分信号发送时，选择有利于较短的终端链路，而当终端链路共享相同的刺激时，则有利于较短的初始链路（和较长的终端链路）。偏好随着刺激条件的反转而有规律地逆转，并且与非差分刺激条件期间两个终端链接之间的区分无关。目前的结果表明，末端链接刺激的相对值和条件增强剂呈现的相对速率是对选择行为的重要影响，并且条件增强模型需要包括这两个因素。
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