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Biol Psychol. 1999 Jun;50(2):89-102.

Effects of conditioned stimulus presentation on diminution of the unconditioned response in aversive classical conditioning.

Author information

1
Departamento de Psicología, Campus de Elviña, Universidad de La Coruña, Spain. jlmarc@udc.es

Abstract

The purpose of this experiment was to study whether conditioned diminution of the unconditioned response (UR) is a phenomenon with an associative basis. Discriminative electrodermal conditioning was used with an interval between the conditioned stimulus (CS) and unconditioned stimulus (US; aversive white-noise) of 8 s. Fifty-nine volunteer subjects received discrimination training in which one CS was reinforced (CS+ /US) and a second CS was non-reinforced (CS-). After this discriminative training phase, participants were tested using intermixed trials in which a US was preceded by either a CS+, a CS-, or a neutral stimulus (NS). The results indicated that the skin conductance response amplitude of the UR was lower when the US was preceded by the CS+ than when the US was preceded by the CS- or the NS. However, NS/US presentations elicited URs of greater amplitude than those of the CS- /US presentations. The results can be explained in terms of orienting reflex reinstatement. In addition, it is argued that conditioned diminution has an associative basis.

PMID:
10403199
[Indexed for MEDLINE]

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