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

Frontiers in Psychology

Vincenzo G. Fiore¹ 

关键词: basal ganglia;    dopamine;    selection;    novelty;    iCub;    intrinsic motivation;   

DOI  :  10.3389/fpsyg.2014.00124

学科分类：心理学（综合）

来源: Frontiers

【 摘 要 】

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.

【 授权许可】

CC BY