Abstract
Recent theories of mindreading explain the recognition of action, intention, and belief of other agents in terms of generative architectures that model the causal relations between observables (e.g., observed movements) and their hidden causes (e.g., action goals and beliefs). Two kinds of probabilistic generative schemes have been proposed in cognitive science and robotics that link to a “theory theory” and “simulation theory” of mindreading, respectively. The former compares perceived actions to optimal plans derived from rationality principles and conceptual theories of others’ minds. The latter reuses one’s own internal (inverse and forward) models for action execution to perform a look-ahead mental simulation of perceived actions. Both theories, however, leave one question unanswered: how are the generative models – including task structure and parameters – learned in the first place? We start from Dennett’s “intentional stance” proposal and characterize it within generative theories of action and intention recognition. We propose that humans use an intentional stance as a learning bias that sidesteps the (hard) structure learning problem and bootstraps the acquisition of generative models for others’ actions. The intentional stance corresponds to a candidate structure in the generative scheme, which encodes a simplified belief-desire folk psychology and a hierarchical intention-to-action organization of behavior. This simple structure can be used as a proxy for the “true” generative structure of others’ actions and intentions and is continuously grown and refined – via state and parameter learning – during interactions. In turn – as our computational simulations show – this can help solve mindreading problems and bootstrap the acquisition of useful causal models of both one’s own and others’ goal-directed actions.
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Notes
These are the binary variables used to enforce transition constraints between the two levels in the hierarchy, namely the blocking constraint (i.e., the high-level state cannot change before the low-level sequence has terminated, that is, \(E^{\text {L}}_t=0 \Rightarrow X^{\text {H}}_t=X^{\text {H}}_{t-1}\)) and the termination constraint (i.e., the high-level state cannot terminate before the low-level sequence has terminated, that is, \(E^{\text {L}}_t=0 \Rightarrow E^{\text {H}}_t=0\)).
This idea is consistent with neural evidence for the way humans represent actions, which ranges from simple kinematic acts to more complex assemblies of goal-directed behaviors [48].
As an example, in a monodimensional feature space representing the velocity, the basic behaviors (nodes) could be as follows: still (null value), walking (medium value), running (high value).
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Acknowledgments
The authors would like to thank Guido Schillaci for useful discussions and background materials.
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The research leading to these results has received funding from the Human Frontier Science Program, Grant RGY0088/2014 to GP, and the European Union Seventh Framework Programme (FP7/2007-2013) under Grant Agreements FP7-270108 (Goal-Leaders) to GP and 604102 (Human Brain Project) to FC.
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Dindo, H., Donnarumma, F., Chersi, F. et al. The intentional stance as structure learning: a computational perspective on mindreading. Biol Cybern 109, 453–467 (2015). https://doi.org/10.1007/s00422-015-0654-6
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DOI: https://doi.org/10.1007/s00422-015-0654-6