Journal
SCIENCE
Volume 358, Issue 6366, Pages 1038-1041Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aag2132
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Funding
- CBMM
- National Science Foundation Science and Technology Center [CCE-1231216]
- National Science Foundation [DGE-1144152]
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Infants understand that people pursue goals, but how do they learn which goals people prefer? We tested whether infants solve this problem by inverting a mental model of action planning, trading off the costs of acting against the rewards actions bring. After seeing an agent attain two goals equally often at varying costs, infants expected the agent to prefer the goal it attained through costlier actions. These expectations held across three experiments that conveyed cost through different physical path features (height, width, and incline angle), suggesting that an abstract variable-such as force, work, or effort-supported infants' inferences. We modeled infants' expectations as Bayesian inferences over utility-theoretic calculations, providing a bridge to recent quantitative accounts of action understanding in older children and adults.
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