Tomoko Imura, Ikuma Adachi, Yuko Hattori and Masaki Tomonaga Perception of the motion trajectory of objects from moving cast shadows in infant Japanese macaques (Macaca fuscata) Developmental Science 16
The shadows cast by moving objects enable human adults and infants to infer the motion trajectories of objects. Nonhuman animals must also be able to discriminate between objects and their shadows and infer the spatial layout of objects from cast shadows. However, the evolutionary and comparative developmental origins of sensitivity to cast shadows have not been investigated.
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