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  1. ; (, Cognitive Science Society)
    A detailed model of the outside world is an essential ingredient of human cognition, enabling us to navigate, form goals, exe- cute plans, and avoid danger. Critically, these world models are flexible—they can arbitrarily expand to introduce previously- undetected objects when new information suggests their pres- ence. Although the number of possible undetected objects is theoretically infinite, people rapidly and accurately infer un- seen objects in everyday situations. How? Here we investigate one approach to characterizing this behavior—as nonparamet- ric clustering over low-level cues—and report preliminary re- sults comparing a computational model to human physical in- ferences from real-world video. 
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