Kimmel H D, Bevill M J
Dept. of Psychology, University of South Florida, Tampa 33620.
Integr Physiol Behav Sci. 1991 Apr-Jun;26(2):132-8. doi: 10.1007/BF02691036.
This paper summarizes the results of three experiments on blocking and unconditioned response diminution in human SCR conditioning. Recent theories of conditioning propose that reduced processing of the unconditioned stimulus due to conditioning results in reduced unconditioned response magnitude and in blocking of conditioning of a second conditioned stimulus when it is in compound with the previously conditioned stimulus. In these experiments, clear evidence of diminution of the unconditioned response was obtained in all three studies, but blocking was found only in the third study, which employed a within-subject design and in which the blocking was observed only after at least one extinction trial on both the blocked and nonblocked stimuli. Order of testing was not a factor in this delayed blocking effect. These results do not support the view that blocking occurs because of reduced processing of the unconditioned stimulus in the unconditioned response diminution sense.
本文总结了三项关于人类皮肤电反应（SCR）条件作用中阻断和非条件反应减弱的实验结果。近期的条件作用理论提出，由于条件作用导致对非条件刺激的加工减少，从而使得非条件反应幅度降低，并且当第二个条件刺激与先前已条件化的刺激复合呈现时，会阻断其条件作用。在这些实验中，所有三项研究均获得了非条件反应减弱的明确证据，但仅在第三项研究中发现了阻断现象，该项研究采用了被试内设计，并且仅在对被阻断和未被阻断的刺激都进行了至少一次消退试验之后才观察到阻断。测试顺序并非这种延迟阻断效应的一个因素。这些结果并不支持如下观点，即阻断的发生是由于在非条件反应减弱意义上对非条件刺激的加工减少所致。
