Unconditioned stimulus rehearsal and the retention and enhancement of differential "fear" conditioning: Effects of trait and state anxiety.

In 2 experiments, the effect of anxiety on the cued-unconditioned stimulus (UCS) rehearsal phenomenon was investigated (T. Jones & G. C. L. Davey, 1990). In Experiment 1, postconditioning rehearsal of the unconditioned stimulus (UCS) resulted in an increase in conditioned response (CR) strength during extinction, but only in subjects with high levels of trait anxiety. An induced mood procedure was used in Experiment 2, and a postrehearsal increase in CR strength was found in subjects who had undergone induced somatic anxiety but not in subjects who had undergone induced worrying or who underwent a neutral induction procedure. In both experiments, the increase in CR strength following UCS rehearsal was associated with inflated ratings of the aversiveness of rehearsing the UCS. These results are discussed in terms of the ways in which anxiety might influence UCS rehearsal and facilitate physiological CRs to the conditioned stimulus.