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- W4309987669 abstract "Human behaviour may be thought of as supported by two different computational-learning mechanisms, model-free and model-based respectively. In model-free strategies, stimulus-response associations are strengthened when actions are followed by a reward and weakened otherwise. In model-based learning, previous to selecting an action, the current values of the different possible actions are computed based on a detailed model of the environment. Previous research with the two-stage task suggests that participants' behaviour usually shows a mixture of both strategies. But, interestingly, a recent study by da Silva and Hare (2020) found that participants primarily deploy model-based behaviour when they are given detailed instructions about the structure of the task. In the present study, we reproduce this essential experiment. Our results confirm that improved instructions give rise to a stronger model-based component. Crucially, we also found a significant effect of reward that became stronger under conditions that favoured the development of strong stimulus-response associations. This suggests that the effect of reward, often taken as indicator of a model-free component, is related to stimulus-response learning." @default.
- W4309987669 created "2022-11-30" @default.
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- W4309987669 date "2022-11-24" @default.
- W4309987669 modified "2023-10-17" @default.
- W4309987669 title "Model-free decision making resists improved instructions and is enhanced by stimulus-response associations" @default.
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- W4309987669 doi "https://doi.org/10.1101/2022.11.23.517672" @default.
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