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Title: Frontal theta oscillatory activity is a common mechanism for the computation of unexpected outcomes and learning rate
Author: Mas-Herrero, E.
Marco Pallarés, Josep
Keywords: Cervell
Funcions theta
Theta functions
Issue Date: 2014
Publisher: Massachusetts Institute of Technology Press
Abstract: In decision-making processes, the relevance of the information yielded by outcomes varies across time and situations. It increases when previous predictions are not accurate and in contexts with high environmental uncertainty. Previous fMRI studies have shown an important role of medial pFC in coding both reward prediction errors and the impact of this information to guide future decisions. However, it is unclear whether these two processes are dissociated in time or occur simultaneously, suggesting that a common mechanism is engaged. In the present work, we studied the modulation of two electrophysiological responses associated to outcome processing the feedback-related negativity ERP and frontocentral theta oscillatory activity with the reward prediction error and the learning rate. Twenty-six participants performed two learning tasks differing in the degree of predictability of the outcomes: a reversal learning task and a probabilistic learning task with multiple blocks of novel cue<br>outcome associations. We implemented a reinforcement learning model to obtain the single-trial reward prediction error and the learning rate for each participant and task. Our results indicated that midfrontal theta activity and feedback-related negativity increased linearly with the unsigned prediction error. In addition, variations of frontal theta oscillatory activity predicted the learning rate across tasks and participants. These results support the existence of a common brain mechanism for the computation of unsigned prediction error and learning rate.
Note: Reproducció del document publicat a:
It is part of: Journal of Cognitive Neuroscience, 2014, vol. 26, num. 3, p. 447-458
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ISSN: 0898-929X
Appears in Collections:Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))
Articles publicats en revistes (Cognició, Desenvolupament i Psicologia de l'Educació)

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