Acquisition and extinction of human avoidance behavior: attenuating effects of omission contingencies of appetitive, aversive and warning cues

Abstract

Abstract Recently, there has been a renewed interest in avoidance behavior, and its applicability to clinical conditions such as anxiety, posttraumatic stress disorder (PTSD) and addiction. In a computer-based avoidance task for humans, participants control an on-screen spaceship, shoot at enemy targets (appetitive cue) to gain points, and learn to respond to an on-screen warning signal (WS) by entering safe “hiding” areas to escape/avoid an aversive event (point loss and on-screen explosion) paired with an on-screen aversive cue (bomb). Prior research on active avoidance in rodents suggests that avoidance learning is facilitated if the response also terminates the WS. Here, we adapted the computer-based task to investigate this idea in healthy humans. Two hundred and twenty-two young adults completed one of three conditions of the task: a non-contingent condition, where hiding caused omission/avoidance of the aversive event but did not terminate the WS; a fully-contingent condition, where hiding also caused omission/termination of all on-screen appetitive and aversive cues as well as terminating the WS; and a partially-contingent condition where hiding caused omission of the appetitive and aversive cues, but did not affect the WS. Both contingency manipulations decreased escape/avoidance behavior, as compared to the non-contingent condition where the WS and other cues are not affected by the avoidance behavior. This study has implications for the basic understanding of the mechanisms that affect avoidance behavior in humans.