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The successor representation in human reinforcement learning

Author(s): Momennejad, Ida; Russek, Evan; Cheong, Jin; Botvinick, Matthew; Daw, Nathaniel; et al

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Abstract: Theories of reward learning in neuroscience have focused on two families of algorithms, thought to capture deliberative vs. habitual choice. Model-based algorithms compute the value of candidate actions from scratch, whereas model-free algorithms make choice more efficient but less flexible by storing pre-computed action values. We examine an intermediate algorithmic family, the successor representation (SR), which balances flexibility and efficiency by storing partially computed action values: predictions about future events. These pre-computation strategies differ in how they update their choices following changes in a task. SR's reliance on stored predictions about future states predicts a unique signature of insensitivity to changes in the task's sequence of events, but flexible adjustment following changes to rewards. We provide evidence for such differential sensitivity in two behavioral studies with humans. These results suggest that the SR is a computational substrate for semi-flexible choice in humans, introducing a subtler, more cognitive notion of habit.
Publication Date: 27-Oct-2016
Citation: Momennejad, Ida, Russek, Evan, Cheong, Jin, Botvinick, Matthew, Daw, Nathaniel, Gershman, Samuel. (2016). The successor representation in human reinforcement learning. 10.1101/083824
DOI: doi:10.1101/083824
Pages: 680-692
Type of Material: Journal Article
Journal/Proceeding Title: Nature Human Behaviour
Version: Author's manuscript

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