A debate has been going as to whether infants' ability to represent acts in terms of goals is sensitive to motions performed by people only (the mirror neuron systems theory) or to a variety of cues through which infants apply the principle of rational action to both human and inanimate agents (the teleological stance theory). Solution to the above issue is timely and important (for notable examples, see Sommerville, Woodward and Needham, 2005; Biro and Leslie, 2006). Robotic scientists have begun to use such knowledge to design robots that mimic human biomechanical movements, to which infants are likely to attribute goals or intentions (Kamewari, Kato, Kanda, Ishiguro and Hiraki, 2005).
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