Pierrel R, Blue S
J Exp Anal Behav. 1967 Nov;10(6):545-50. doi: 10.1901/jeab.1967.10-545.
In order to assess possible confounding of discriminative stimulus effects with those produced by the reinforcing stimulus, three groups of four rats each were trained for 45 hr on a variable-interval 1-min reinforcement program. Two groups were run on a multiple variable-interval extinction schedule in which the reinforcement stimulus (S(D)) and the nonreinforcement stimulus (S(Delta)) were two intensities of a 4-kHz (cps) tone separated by 40 or 10 db. The third group was run on a mixed schedule with a single intensity constantly present. The mixed-schedule animals showed no discrimination of the reinforcement program. Under the multiple schedule, the highest S(Delta) rates were obtained after S(D) intervals, regardless of the reinforcement availability in the S(D) interval. These local rate variations in S(Delta) were small in proportion to those produced by the S(D)versus S(Delta) intensities.
为了评估辨别性刺激效应与强化性刺激所产生的效应之间可能存在的混淆，将三组大鼠，每组四只，在可变间隔1分钟强化程序上训练45小时。两组大鼠按照多重可变间隔消退程序进行实验，其中强化性刺激（S(D)）和非强化性刺激（S(Delta)）是4千赫兹（赫兹）音调的两种强度，相差40或10分贝。第三组大鼠按照单一强度持续存在的混合程序进行实验。混合程序组的动物没有对强化程序进行辨别。在多重程序下，无论S(D)间隔内的强化可用性如何，在S(D)间隔之后都能获得最高的S(Delta)速率。与S(D)和S(Delta)强度所产生的速率变化相比，S(Delta)的这些局部速率变化较小。
