Measuring extinction learning across the lifespan - Adaptation of an optimized paradigm to closely match exposure...

Here, we tested the feasibility of a new paradigm developed to investigate the mechanisms of exposure-therapy. The protocol was previously developed for the use with adults and optimized to closely model the mechanisms underlying exposure, i.e. extinction learning. We adapted this paradigm for the use with children, and tested its feasibility in children and adult participants. We used an aversive acoustic unconditioned stimulus (US), picture-based rating scales and a child-oriented instruction/practice procedure. Results indicate robust fear acquisition, extinction and reinstatement on a self-report (US-expectancy) and on a physiological (startle reflex) level. We found evidence for the paradigms sensitivity to age and anxiety-dependent individual differences in fear-learning and extinction. We conclude that the present paradigm is capable of modeling the key mechanisms of exposure-therapy, that is extinction-learning, and can be accomplished with children, adolescents and adults, rendering it promising to bridge the gap between experimental protocols and treatment across the lifespan.