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Increased dopamine release after working-memory updating training: Neurochemical correlates of transfer
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 7160Article in journal (Refereed) Published
Abstract [en]

Previous work demonstrates that working-memory (WM) updating training results in improved performance on a letter-memory criterion task, transfers to an untrained n-back task, and increases striatal dopamine (DA) activity during the criterion task. Here, we sought to replicate and extend these findings by also examining neurochemical correlates of transfer. Four positron emission tomography (PET) scans using the radioligand raclopride were performed. Two of these assessed DAD2 binding (letter memory; n-back) before 5 weeks of updating training, and the same two scans were performed post training. Key findings were (a) pronounced training-related behavioral gains in the lettermemory criterion task, (b) altered striatal DAD2 binding potential after training during letter-memory performance, suggesting training-induced increases in DA release, and (c) increased striatal DA activity also during the n-back transfer task after the intervention, but no concomitant behavioral transfer. The fact that the training-related DA alterations during the transfer task were not accompanied by behavioral transfer suggests that increased DA release may be a necessary, but not sufficient, condition for behavioral transfer to occur.

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NATURE PUBLISHING GROUP , 2017. Vol. 7, article id 7160
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Neurosciences
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URN: urn:nbn:se:umu:diva-138584DOI: 10.1038/s41598-017-07577-yISI: 000406816300033PubMedID: 28769095OAI: oai:DiVA.org:umu-138584DiVA, id: diva2:1144136
Available from: 2017-09-25 Created: 2017-09-25 Last updated: 2018-06-09Bibliographically approved

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Andersson, MicaelNyberg, Lars

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