J Exp Anal Behav. 1969 Jan;12(1):11-6. doi: 10.1901/jeab.1969.12-11.
Pigeons were exposed to two equal, concurrent variable-interval schedules of reinforcement on two response keys. One key was continuously illuminated. Pecking on that key produced reinforcements of constant duration. The other key was normally dark, except that availability of reinforcement was signalled by illuminating the key. The duration of access to a grain reinforcer was varied on the key that signalled reinforcement. Rate of response on the first key, the one that did not signal reinforcement, was found to vary inversely with duration of signalled reinforcement on the other key. The latency between the signal and the peck that produced signalled reinforcement remained about constant. These results show that responding on one key in concurrent variable-interval schedules depends on the reinforcement delivered by both schedules and is independent of responding on the other key.
鸽子在两个响应键上同时接受两个相等的可变间隔强化程序。一个键持续发光。啄那个键会产生持续时间不变的强化物。另一个键通常是黑暗的，只有在发出强化信号时才会照亮该键。在发出强化信号的键上，获得谷物强化物的时间长短是变化的。发信号键上的信号和产生信号强化的啄之间的潜伏期保持不变。这些结果表明，在同时进行的可变间隔时间表中，对一个键的反应取决于两个时间表提供的强化，而与另一个键的反应无关。
