Stoddard L T, Sidman M
J Exp Anal Behav. 1971 Sep;16(2):143-54. doi: 10.1901/jeab.1971.16-143.
When a well-learned circle versus ellipse discrimination was made impossibly difficult for the subjects (rhesus monkeys), the controlling stimulus-response topographies were replaced by competing topographies. The identification of two training conditions sufficient to reinstate the original discrimination permitted the following inferences: the original controlling topography had merely decreased in probability of occurrence, whereas the "strength" of the stimulus-response relation remained unchanged; discriminations along the apparently continuous circle-ellipse dimension actually involved several distinct stimulus-control topographies.
当让受试者(恒河猴)对已经熟练掌握的圆形与椭圆形辨别任务变得极其困难时,控制性的刺激-反应形式被竞争性形式所取代。确定足以恢复原始辨别的两种训练条件后,可得出以下推论:原始的控制性形式仅仅是出现概率降低了,而刺激-反应关系的“强度”保持不变;沿着明显连续的圆形-椭圆形维度进行的辨别实际上涉及几种不同的刺激控制形式。