Consuming more energy than is expended may reflect a failure of control over eating behaviour in obesity. Behavioural control arises from a balance between two dissociable strategies of reinforcement learning: model-free and model-based. We hypothesized that weight status relates to an imbalance in reliance on model-based and model-free control, and that it may do so in a linear or quadratic manner. To test this, 90 healthy participants in a wide BMI range (normal-weight (n=31), overweight (n=29), obese (n=30)) performed a sequential decision-making task. The primary analysis indicated that obese participants relied less on model-based control than overweight and normal-weight participants, with no difference between overweight and normal-weight participants. In line, secondary continuous analyses revealed a negative linear, but not quadratic, relationship between BMI and model-based control. Computational modelling of choice behaviour suggested that a mixture of both strategies was shifted towards less model-based control in obese participants. Furthermore, exploratory analyses of separate weights for model-free and model-based control showed stronger reliance on model-free control with increased BMI. Our findings suggest that obesity may indeed be related to an imbalance in behavioural control as expressed in a phenotype of less model-based control potentially resulting from enhanced reliance on model-free computations.


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    Titel :

    Reliance on model-based and model-free control in obesity


    Beteiligte:
    Janssen, L. (Autor:in) / Mahner, F. (Autor:in) / Schlagenhauf, F. (Autor:in) / Deserno, L. (Autor:in) / Horstmann, A. (Autor:in)

    Erscheinungsdatum :

    2019-07-17


    Anmerkungen:

    PsyArXiv


    Medientyp :

    Paper


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    DDC:    150 / 629



    Reliance on model-based and model-free control in obesity

    Janssen, Lieneke K / Mahner, Florian / Schlagenhauf, Florian et al. | BASE | 2020

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