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Embodied Choice: How Action Influences Perceptual Decision Making

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  • Nathan F Lepora
  • Giovanni Pezzulo

Abstract

Embodied Choice considers action performance as a proper part of the decision making process rather than merely as a means to report the decision. The central statement of embodied choice is the existence of bidirectional influences between action and decisions. This implies that for a decision expressed by an action, the action dynamics and its constraints (e.g. current trajectory and kinematics) influence the decision making process. Here we use a perceptual decision making task to compare three types of model: a serial decision-then-action model, a parallel decision-and-action model, and an embodied choice model where the action feeds back into the decision making. The embodied model incorporates two key mechanisms that together are lacking in the other models: action preparation and commitment. First, action preparation strategies alleviate delays in enacting a choice but also modify decision termination. Second, action dynamics change the prospects and create a commitment effect to the initially preferred choice. Our results show that these two mechanisms make embodied choice models better suited to combine decision and action appropriately to achieve suitably fast and accurate responses, as usually required in ecologically valid situations. Moreover, embodied choice models with these mechanisms give a better account of trajectory tracking experiments during decision making. In conclusion, the embodied choice framework offers a combined theory of decision and action that gives a clear case that embodied phenomena such as the dynamics of actions can have a causal influence on central cognition.Author Summary: The modern view of how we make perceptual decisions is of a process of accumulating sensory evidence until reaching a threshold level of certainty. However, this evidence accumulation model neglects the contribution of action and motor processes to the choice that is made. Recent novel studies that track the changing dynamics of actions during perceptual decisions are increasingly revealing the contribution of the actions we make to our perceptual choices. Thus, the action dynamics of our bodies causally influences our central cognition, which is a core assumption of embodied theories of mind. This paper presents an explanation of how actions, encompassing behavioral strategies such as preparation and commitment, can bias decision making processes in ways that optimize the ecological choices of animals behaving in natural environments. It thus combines two disconnected research streams, decision-making and action control in a manner consistent with theoretical and psychological arguments for embodied cognition.

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  • Nathan F Lepora & Giovanni Pezzulo, 2015. "Embodied Choice: How Action Influences Perceptual Decision Making," PLOS Computational Biology, Public Library of Science, vol. 11(4), pages 1-22, April.
  • Handle: RePEc:plo:pcbi00:1004110
    DOI: 10.1371/journal.pcbi.1004110
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    Cited by:

    1. Grant Soosalu & Suzanne Henwood & Arun Deo, 2019. "Head, Heart, and Gut in Decision Making: Development of a Multiple Brain Preference Questionnaire," SAGE Open, , vol. 9(1), pages 21582440198, March.
    2. repec:cup:judgdm:v:14:y:2019:i:4:p:455-469 is not listed on IDEAS
    3. Francesco Donnarumma & Domenico Maisto & Giovanni Pezzulo, 2016. "Problem Solving as Probabilistic Inference with Subgoaling: Explaining Human Successes and Pitfalls in the Tower of Hanoi," PLOS Computational Biology, Public Library of Science, vol. 12(4), pages 1-30, April.
    4. Arkady Zgonnikov & Nadim A. A. Atiya & Denis O'Hora & Iñaki Rañò & KongFatt Wong-Lin, 2019. "Beyond reach: Do symmetric changes in motor costs affect decision making? A registered report," Judgment and Decision Making, Society for Judgment and Decision Making, vol. 14(4), pages 455-469, July.

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