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• W4308274920 abstract "Abstract A standard assumption in neuroscience is that low-effort model-free learning is automatic and continuously employed, while more complex model-based strategies are only used when the rewards they generate are worth the additional effort. We present evidence refuting this assumption. First, we demonstrate flaws in previous reports of combined model-free and model-based reward prediction errors in the ventral striatum that likely led to spurious results. More appropriate analyses yield no evidence of a model-free prediction errors in this region. Second, we find that task instructions generating more correct model-based behaviour reduce rather than increase mental effort. This is inconsistent with cost-benefit arbitration between model-based and model-free strategies. Together, our data suggest that model-free learning may not be automatic. Instead, humans can reduce mental effort by using a model-based strategy alone rather than arbitrating between multiple strategies. Our results call for re-evaluation of the assumptions in influential theories of learning and decision-making." @default.
• W4308274920 created "2022-11-10" @default.
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• W4308274920 date "2022-11-04" @default.
• W4308274920 modified "2023-09-25" @default.
• W4308274920 title "A new take on model-based and model-free influences on mental effort and striatal prediction errors" @default.
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• W4308274920 doi "https://doi.org/10.1101/2022.11.04.515162" @default.
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