LONG-TERM RETENTION OF FEAR-POTENTIATED STARTLE FOLLOWING A SHORT TRAINING SESSION

The permanence of aversive memories has been reported to vary when assessed with conditioned emotional response procedures (months) versus avoidance response measures (days). When evaluated with the potentiated startle paradigm, five light-shock pairings at a 2-min intertrial interval produced highly reliable potentiated startle, which was similar in magnitude from 1 to 28 days after training and maximal using a 0.6-mA footshock intensity. These results are consistent with such measures as conditioned emotional response procedures, in which aversive memories have been observed after months following originaltraining. The results obtained with various shock intensities are also discussed in the context of other indices of fear. © 1990 Psychonomic Society, Inc.