强化程序：在产生强化物之前的反应的作用。
Reinforcement schedules: the role of responses preceding the one that produces the reinforcer.
出版信息
J Exp Anal Behav. 1971 May;15(3):271-87. doi: 10.1901/jeab.1971.15-271.
In a two-key pigeon chamber, variable-interval reinforcement was scheduled for a specified number of pecks, emitted either on a single key or in a particular sequence on the two keys. Although the distribution of pecks between the two keys was affected by whether pecks were required on one or on both keys, the total pecks emitted was not; the change from a one-key to a two-key requirement simply moved some pecks from one key to the other. Thus, each peck preceding the one that produced the reinforcer contributed independently to the subsequent rate of responding; the contribution of a particular peck in the sequence was determined by the time between its emission and the delivery of the reinforcer (delay of reinforcement), and was identified by the proportion of pecks moved from one key to the other when the response requirement at that point in the sequence was moved from one key to the other.
在一个双键鸽子室中，根据特定的啄击次数，对可变间隔强化进行了安排，可以在单个键或两个键上的特定序列上发出啄击。尽管啄击在两个键之间的分布受到啄击是在一个键上还是在两个键上需要的影响，但啄击的总数并没有受到影响；从一个键的要求变为两个键的要求只是将一些啄击从一个键转移到另一个键。因此，在产生强化物之前的每一次啄击都独立地对随后的反应速度做出贡献；序列中特定啄击的贡献取决于其发出和强化物交付之间的时间（强化物的延迟），并通过在序列中该点的响应要求从一个键转移到另一个键时从一个键转移到另一个键的啄击比例来确定。
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