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• W2337403113 startingPage "37" @default.
• W2337403113 abstract "There is a well-established literature linking obesity to altered dopamine signaling and brain response to food-related stimuli. Neuroimaging studies frequently report enhanced responses in dopaminergic regions during food anticipation and decreased responses during reward receipt. This has been interpreted as reflecting anticipatory “reward surfeit”, and consummatory “reward deficiency”. In particular, attenuated response in the dorsal striatum to primary food rewards is proposed to reflect anhedonia, which leads to overeating in an attempt to compensate for the reward deficit. In this paper, we propose an alternative view. We consider brain response to food-related stimuli in a reinforcement-learning framework, which can be employed to separate the contributions of reward sensitivity and reward-related learning that are typically entangled in the brain response to reward. Consequently, we posit that decreased striatal responses to milkshake receipt reflect reduced reward-related learning rather than reward deficiency or anhedonia because reduced reward sensitivity would translate uniformly into reduced anticipatory and consummatory responses to reward. By re-conceptualizing reward deficiency as a shift in learning about subjective value of rewards, we attempt to reconcile neuroimaging findings with the putative role of dopamine in effort, energy expenditure and exploration and suggest that attenuated brain responses to energy dense foods reflect the “fuel”, not the fun entailed by the reward." @default.
• W2337403113 created "2016-06-24" @default.
• W2337403113 creator A5027823044 @default.
• W2337403113 creator A5077959151 @default.
• W2337403113 date "2016-08-01" @default.
• W2337403113 modified "2023-10-02" @default.
• W2337403113 title "Fuel not fun: Reinterpreting attenuated brain responses to reward in obesity" @default.
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