The AAT includes 20 pictures of drug-related stimuli and 20 pictures of non-drug related stimuli. Pictures are presented equally in landscape and portrait format. After the pictures appear on a monitor, participants will be instructed to use a joystick to either enlarge (pull the joystick closer) or shrink (push the joystick away) the pictures. In this task, the required response is unrelated to the content of the pictures. Specifically, participants are instructed to pull the joystick to approach pictures in portrait format or push pictures in landscape format. The difference between the median response time for drug versus non-drug related pictures is used as a measure of bias. The AAT takes 5 minutes to complete.