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Neurochemical Modulation of Response Inhibition and Probabilistic Learning in Humans
Samuel R. Chamberlain,1,3*Ulrich Müller,1,2,3Andrew D. Blackwell,1,3Luke Clark,2,3Trevor W. Robbins,2,3Barbara J. Sahakian1,3
Cognitive functions dependent on the prefrontal cortex, suchas the ability to suppress behavior (response inhibition) andto learn from complex feedback (probabilistic learning), playcritical roles in activities of daily life. To what extent dodifferent neurochemical systems modulate these two cognitivefunctions? Here, using stop-signal and probabilistic learningtasks, we show a double dissociation for the involvement ofnoradrenaline and serotonin in human cognition. In healthy volunteers,inhibition of central noradrenaline reuptake improved responseinhibition but had no effect on probabilistic learning, whereasinhibition of central serotonin reuptake impaired probabilisticlearning with no effect on response inhibition.
1 Department of Psychiatry, University of Cambridge School of Clinical Medicine, Addenbrooke's Hospital, Box 189, Cambridge CB2 2QQ, UK. 2 Department of Experimental Psychology, University of Cambridge, Cambridge CB2 3EB, UK. 3 Behavioural and Clinical Neuroscience Institute, University of Cambridge, Cambridge CB2 3EB, UK.
* To whom correspondence should be addressed. E-mail: src33{at}cam.ac.uk
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