The cognitive effects of a promised bonus do not depend on dopamine synthesis capacity
SourceScientific Reports, 10, 1, (2020), article 16473
Article / Letter to editor
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PI Group Motivational & Cognitive Control
Onderzoekcentrum voor Staat en Recht
aPI Group Food and Cognition
Subject170 000 Motivational & Cognitive Control; 330 000 Food & Cognition; Radboudumc 13: Stress-related disorders DCMN: Donders Center for Medical Neuroscience
Reward motivation is known to enhance cognitive control. However, detrimental effects have also been observed, which have been attributed to overdosing of already high baseline dopamine levels by further dopamine increases elicited by reward cues. Aarts et al. (2014) indeed demonstrated, in 14 individuals, that reward effects depended on striatal dopamine synthesis capacity, measured with [(18)F]FMT-PET: promised reward improved Stroop control in low-dopamine individuals, while impairing it in high-dopamine individuals. Here, we aimed to assess this same effect in 44 new participants, who had previously undergone an [(18)F]DOPA-PET scan to quantify dopamine synthesis capacity. This sample performed the exact same rewarded Stroop paradigm as in the prior study. However, we did not find any correlation between reward effects on cognitive control and striatal dopamine synthesis capacity. Critical differences between the radiotracers [(18)F]DOPA and [(18)F]FMT are discussed, as the discrepancy between the current and our previous findings might reflect the use of the potentially less sensitive [(18)F]DOPA radiotracer in the current study.
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