Overmier J B, Payne R J, Brackbill R M, Linder B, Lawry J A
Acta Neurobiol Exp (Wars). 1979;39(6):603-20.
Three experiments with 49 dogs explored the decrease in CR magnitude that sometimes occurs when CS-US pairings are continued beyond those needed to reach maximum CR magnitude. The first experiment confirmed the existence of the phenomenon, obtaining less conditioned excitation after 300 CS-US trials than after 18 CS-US trials. The second experiment demonstrated that the phenomenon is not dependent upon paired CS-US presentations because 18 CS-US pairings yielded little excitation if preceded by, followed by, or intermixed with 282 US presentations. The third experiment indicated that in contrast to the decremental effects on excitatory conditioning, inhibitory conditioning was faciliated by large numbers of prior US exposures, suggesting explanation of the post-asymptotic decrement phenomenon by opponent-process theory.
三项针对49只狗的实验探究了一种现象：当条件刺激（CS）与非条件刺激（US）的配对次数超过达到最大条件反应（CR）强度所需的次数时，CR强度有时会降低。第一个实验证实了该现象的存在，在300次CS-US试验后获得的条件性兴奋比在18次CS-US试验后少。第二个实验表明，该现象并不依赖于CS-US配对呈现，因为如果在18次CS-US配对之前、之后或与之混合有282次US呈现，产生的兴奋很少。第三个实验表明，与对兴奋性条件作用的递减效应相反，大量先前的US暴露促进了抑制性条件作用，这表明可以用对立过程理论来解释渐近后递减现象。
