Striatal dopamine waves as a mechanism for spatiotemporal credit assignment
Автор: Experimental Psychology Dept, University of Oxford
Загружено: 2021-11-05
Просмотров: 774
Описание:
This talk is delivered by Arif Hamid from the University of Minnesota. Find out more at https://arifahamid.com/index.html.
ABSTRACT:
Significant evidence supports the view that dopamine shapes reward-learning by encoding prediction errors. However, it is unknown whether dopamine decision signals are tailored to the functional specialisation of target regions. In this talk, I will report on a novel set of wave-like spatiotemporal activation patterns in dopamine axons and release across the dorsal striatum that switch between different activational motifs. At reward delivery, waves are altered by task demands, propagating from dorsomedial to dorsolateral striatum during instrumental contingencies, and in the opponent direction when rewards are independent of animal behaviour. I will demonstrate that our results are consistent with a computational architecture in which striatal dopamine signals are sculpted by inference about agency, and provide evidence for a spatiotemporally “vectorised” role of dopamine in credit assignment that is directed toward specialised “expert” striatal subregions.
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