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Keep focussing: striatal dopamine multiple functions resolved in a single mechanism tested in a simulated humanoid robot.

Fiore, VG; Sperati, V; Mannella, F; Mirolli, M; Gurney, K; Friston, K; Dolan, RJ; (2014) Keep focussing: striatal dopamine multiple functions resolved in a single mechanism tested in a simulated humanoid robot. Front Psychol , 5 , Article 124. 10.3389/fpsyg.2014.00124. Green open access

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Abstract

The effects of striatal dopamine (DA) on behavior have been widely investigated over the past decades, with "phasic" burst firings considered as the key expression of a reward prediction error responsible for reinforcement learning. Less well studied is "tonic" DA, where putative functions include the idea that it is a regulator of vigor, incentive salience, disposition to exert an effort and a modulator of approach strategies. We present a model combining tonic and phasic DA to show how different outflows triggered by either intrinsically or extrinsically motivating stimuli dynamically affect the basal ganglia by impacting on a selection process this system performs on its cortical input. The model, which has been tested on the simulated humanoid robot iCub interacting with a mechatronic board, shows the putative functions ascribed to DA emerging from the combination of a standard computational mechanism coupled to a differential sensitivity to the presence of DA across the striatum.

Type: Article
Title: Keep focussing: striatal dopamine multiple functions resolved in a single mechanism tested in a simulated humanoid robot.
Location: Switzerland
Open access status: An open access version is available from UCL Discovery
DOI: 10.3389/fpsyg.2014.00124
Publisher version: http://dx.doi.org/10.3389/fpsyg.2014.00124
Language: English
Additional information: © 2014 Fiore, Sperati, Mannella, Mirolli, Gurney, Friston, Dolan and Baldassarre. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Keywords: basal ganglia, dopamine, iCub, intrinsic motivation, novelty, selection
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Imaging Neuroscience
URI: https://discovery.ucl.ac.uk/id/eprint/1421499
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