Infants failing to confuse mental states with objects proves only functional discrimination, not metaphysical substance dualism, since a functionalist monist predicts identical behavior.

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Functionalist monist(as used in philosophy of mind): Someone who believes the mind and body are ultimately one thing, and that mental states are best understood by what they do, not by assuming minds are non-physical.
discrimination(Raised as a condition potentially necessary for self-knowledge): The ability of a subject to distinguish a priori between two concepts (e.g., the water concept and the Dry Earthian concept)
functionalism(Philosophy of mind; distinguished here from representationalism): The view that mental states are defined by the causal roles they play in a cognitive system — their actual, potential, or typical causal relationships.
mental states(Herder's theory of mind): Conditions consisting in forces that manifest themselves in people's bodily behavior, conceptually tied to corresponding types of bodily behavior but not reducible thereto

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