J Exp Anal Behav. 1977 Mar;27(2):219-33. doi: 10.1901/jeab.1977.27-219.
In Experiment I, 24 rats were trained on a multiple variable-interval variable-interval schedule with a doorlight and white noise serving as component cues. Two groups were then shifted to a multiple extinction variable-interval schedule, and a third group was maintained on the multiple variable-interval variable-interval schedule. The multiple extinction variable-interval condition produced positive contrast when either the light or noise signalled extinction, and both of these cues acquired inhibitory stimulus control as measured by a combined cue test. In Experiment II, the multiple variable-interval variable-interval condition was shifted to multiple extinction variable-interval for one group, to multiple variable-time variable-interval for a second group, and was unchanged for the third group. The two experimental conditions produced identical patterns of response-rate reduction in the altered component, but the multiple extinction variable-interval condition produced positive contrast, whereas the multiple variable-time variable-interval condition did not. Subsequent combined cue and resistance to reinforcement tests revealed that the cue signalling extinction acquired stronger inhibitory stimulus control than the cue signalling variable time.
在实验 I 中，24 只大鼠接受了一个多变量间隔变量间隔程序的训练，其中门灯和白噪声作为成分线索。然后，两组被转移到多消除变量间隔程序，第三组则继续接受多变量间隔变量间隔程序。当灯光或噪音表示消除时，多消除变量间隔条件产生正对比，这两个线索都通过综合线索测试获得了抑制性刺激控制。在实验 II 中，一组的多变量间隔变量间隔条件转移到多消除变量间隔，另一组转移到多变量时间变量间隔，第三组不变。两种实验条件在改变的成分中产生了相同的反应率降低模式，但多消除变量间隔条件产生了正对比，而多变量时间变量间隔条件则没有。随后的综合线索和抗强化测试表明，信号消除的线索比信号变量时间的线索获得了更强的抑制性刺激控制。
