title: Dissociation of neural networks for anticipation and consumption of monetary and social rewards.
abstract: Human behaviour is generally guided by the anticipation of potential outcomes that are considered to be rewarding. Reward processing can thus be dissected into a phase of reward anticipation and a phase of reward consumption. A number of brain structures have been suggested to be involved in reward processing. However, it is unclear whether anticipation and consumption are mediated by the same or different neural networks. We examined the neural basis of these processes using functional magnetic resonance imaging (fMRI) in an incentive delay task offering either money or social approval. In both conditions participants (N=28) were given a cue indicating potential reward. In order to receive reward a target button had to be pushed within a certain time window (adapted for individual reaction time). Cues triggering either monetary or social reward anticipation were presented sessionwise. Imaging was performed on a 1.5-Tesla Philips scanner in an event-related design. Anticipation of both reward types activated brain structures constituting the brain reward system including the ventral striatum. In contrast to the task independent activity in the anticipation phase, reward consumption evoked different patterns of activation for money and social approval, respectively. While social stimuli were mainly associated with amygdala activation, the thalamus was more strongly activated by the presentation of monetary rewards. Our results identify dissociable neural networks for the anticipation and consumption of reward. The findings implicate that the neural mechanisms underlying reward consumption are more modality-specific than those for reward anticipation, and that they are mediated by subjective reward value.
authors.affiliation: Department of Psychiatry and Psychotherapy, Medical Faculty, RWTH Aachen University, and JARA-Translational Brain Medicine, Pauwelsstr. 30, 52074 Aachen, Germany.
authors.forename: Lena
authors.initials: L
authors.lastname: Rademacher
authors.forename: Sören
authors.initials: S
authors.lastname: Krach
authors.forename: Gregor
authors.initials: G
authors.lastname: Kohls
authors.forename: Arda
authors.initials: A
authors.lastname: Irmak
authors.forename: Gerhard
authors.initials: G
authors.lastname: Gründer
authors.forename: Katja N
authors.initials: KN
authors.lastname: Spreckelmeyer
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology*; D003463:Cues; D003657:Decision Making / Q000502:physiology*; D005260:Female; D006801:Humans; D019545:Intuition / Q000502:physiology*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000502:physiology*; D012054:Reinforcement, Psychology; D012201:Reward; D055815:Young Adult