2017
DOI: 10.7554/elife.26424
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Attenuation of dopamine-modulated prefrontal value signals underlies probabilistic reward learning deficits in old age

Abstract: Probabilistic reward learning is characterised by individual differences that become acute in aging. This may be due to age-related dopamine (DA) decline affecting neural processing in striatum, prefrontal cortex, or both. We examined this by administering a probabilistic reward learning task to younger and older adults, and combining computational modelling of behaviour, fMRI and PET measurements of DA D1 availability. We found that anticipatory value signals in ventromedial prefrontal cortex (vmPFC) were att… Show more

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Cited by 48 publications
(72 citation statements)
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References 86 publications
(158 reference statements)
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“…Similarly, Chowdhury et al , (2013 a ) demonstrated that older adults do not show a representation of expected value in the ventral striatum when performing a probabilistic reward learning under basal conditions and that an expected value representation was only observed after boosting the dopaminergic system with L-DOPA. Furthermore, older adults performing a probabilistic reward learning task show an attenuation of value anticipation in the ventromedial prefrontal cortex (vmPFC) that predicts performance in the probabilistic learning task (de Boer et al , 2017). These findings suggest that whilst general reward processing may be intact in older adults, they are impaired in learning the predictive value of probabilistic reward cues.…”
Section: Discussionmentioning
confidence: 99%
“…Similarly, Chowdhury et al , (2013 a ) demonstrated that older adults do not show a representation of expected value in the ventral striatum when performing a probabilistic reward learning under basal conditions and that an expected value representation was only observed after boosting the dopaminergic system with L-DOPA. Furthermore, older adults performing a probabilistic reward learning task show an attenuation of value anticipation in the ventromedial prefrontal cortex (vmPFC) that predicts performance in the probabilistic learning task (de Boer et al , 2017). These findings suggest that whilst general reward processing may be intact in older adults, they are impaired in learning the predictive value of probabilistic reward cues.…”
Section: Discussionmentioning
confidence: 99%
“…Christakou et al ( 2013 ) report the neural representation of state-action values to become stronger from adolescence to adulthood; however, they did not find this to be related to behavioral differences. In older adults, state-action value signals are reduced (Tobia et al, 2016 ; de Boer et al, 2017 ) and signal strength predicts performance in a probabilistic decision-making task (de Boer et al, 2017 ), suggesting that the age-related deterioration of value signals in the vmPFC may explain the behavioral deficits.…”
Section: Modeling Analyses Beyond Parameter Estimationmentioning
confidence: 99%
“…Dopamine D1 receptors (D1R) dominate in the direct striatal "go" pathway and in prefrontal cortex (6). Prefrontal D1R availability was related to reward learning (7), and prefrontal D1R activation may enhance cue-triggered goal-directed behavior by strengthening prefrontal goal representations (8). Likewise, according to a recent theoretical model on striatal dopamine (9), striatal D1R activity both facilitates the updating of cue-outcome associations after unexpected positive feedback and increases instrumental behavior in response to reward-predicting cues.…”
Section: Introductionmentioning
confidence: 99%