Mandell C
J Exp Anal Behav. 1984 Sep;42(2):291-303. doi: 10.1901/jeab.1984.42-291.
Pigeons responded in a two-alternative forced-choice task in which reinforcement was dependent upon the frequency of events that occurred in an immediately preceding schedule sample. On a given trial the events were either brief food presentations or brief visual and auditory stimulus changes. High levels of stimulus control were obtained by food-presentation schedules only. Discriminative control by frequency or stimulus change was absent. Stimulus control by food frequency was decreased by the imposition of a delay period between the schedule sample and the choice. Moreover, stimulus control by food frequency was related to the ratio of food-presentation schedule pairs when novel schedules were presented in a transfer test.
鸽子在二选一强制选择任务中做出反应，其中强化取决于紧接在前的时间表样本中发生的事件频率。在给定的试验中，事件要么是短暂的食物呈现，要么是短暂的视觉和听觉刺激变化。只有通过食物呈现时间表才能获得高水平的刺激控制。不存在频率或刺激变化的辨别控制。在时间表样本和选择之间设置延迟期会降低食物频率的刺激控制。此外，在转移测试中呈现新的时间表时，食物频率的刺激控制与食物呈现时间表对的比例有关。
