Urcuioli P J, DeMarse T B
Purdue University, Department of Psychological Sciences, West Lafayette, Indiana 47907-1364, USA.
J Exp Anal Behav. 1997 May;67(3):323-36. doi: 10.1901/jeab.1997.67-323.
Pigeons were trained on a pair-comparison task in which left versus right choices were reinforced following different sequences of two center-key stimuli. Choice accuracy was higher when retention intervals occurred after the entire sequence than when they separated the two stimuli comprising it, and this effect occurred independently of whether the initial and terminal stimuli came from the same or different dimensions. The initial stimulus from the prior trial was a source of proactive interference only in groups for which the retention interval separated the two sequence stimuli. By contrast, differential delay-interval behavior was observed only in groups for which the retention interval followed presentation of the entire sequence. These results indicate that coding processes in delayed discriminations are influenced by the location of the retention interval, and that response mediation affects retention performances if the reinforced choice can be determined prior to the interval.
鸽子接受了一项配对比较任务的训练，在该任务中，根据两个中央键刺激的不同序列强化左右选择。当整个序列之后出现保持间隔时，选择准确性高于当保持间隔将构成序列的两个刺激分开时，并且这种效应的出现与初始和终端刺激是来自相同维度还是不同维度无关。前一次试验的初始刺激仅在保持间隔将两个序列刺激分开的组中是前摄干扰的来源。相比之下，仅在保持间隔跟随整个序列呈现的组中观察到差异延迟间隔行为。这些结果表明，延迟辨别中的编码过程受保持间隔位置的影响，并且如果在间隔之前可以确定强化选择，则反应中介会影响保持表现。
