Differences in orbitofrontal activation during decision ...
Mill Road, Cambridge, UK T. W. Robbins Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge, UK . methadonemaintained opiate users exhibited a risktaking strategy, choosing the most likely option less frequently than heroin users and controls. Amphetamine users and former drug users (65% of whom had been on methadone) did not show .