Modeling Human Inference of Others' Intentions in Complex Situations with Plan Predictability Bias

AbstractA recent approach based on Bayesian inverse planning for the “theory of mind” has shown good performance in modeling human cognition. However, perfect inverse planning differs from human cognition during one kind of complex tasks due tohumanboundedrationality. Oneexampleisanenvironment inwhichtherearemanyavailableplansforachievingaspecific goal. We propose a “plan predictability oriented model” as a model of inferring other peoples’ goals in complex environments. This model adds the bias that people prefer predictable plans. This bias is calculated with simple plan prediction. We tested this model with a behavioral experiment in which humans observed the partial path of goal-directed actions. Our modelhadahighercorrelationwithhumaninference. Wealso confirmedtherobustnessofourmodelwithcomplextasksand determined that it can be improved by taking account of individual differences in “bounded rationality”.

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