Avoiding at all costs? Higher approach incentives disrupt protection-from-extinction

Avoidance decisions and their effect on fear extinction were investigated in two separate studies with varying avoidance costs. In both studies, a Virtual Reality fear conditioning procedure with ecologically relevant avoidance costs (temporal delay and physical effort) was employed.

Participants had to choose between a safe stimulus (low reward, no unconditioned stimulus (US)) and a risky stimulus (high reward, 75% chance of encountering the US). After differential fear acquisition and learning to prevent the US using a virtual avoidance button (avoidance learning), participants were randomized to an Avoidance condition or No Avoidance condition during fear extinction. Results showed high (Study 1), but not low (Study 2), avoidance costs resulted in less avoidance behaviour.