The Impact of Methadone Maintenance Therapy on Food Reward Processing in Opioid Dependence

This task measures odor identification accuracy and perceived pleasantness of odors.

This task measures participant ratings of sucrose preference.

Participants rate images of various food stimuli. Variables derived include relative preferences and reaction time (in milliseconds).

In the PR task, the subject is required to make an increasing number of operant responses for each successive reward

To examine motivated attention in response to food stimuli, brain electrophysiology via event related potentials (ERPs) will be assessed while participants view and rate images of food and non-food items.

Participants will receive a standardized meal and complete hunger and satiety ratings.