An argument is presented showing that the postulation of psychological capabilities that are jointly necessary to and specific to other capabilities involves strong theoretical commitments that have not generally been recognized. The argument is first developed in terms of examples drawn from language development and evolution. It is then generalized beyond language and, further, shown to apply to acquired capabilities as well as to innate capabilities. The discussion presents a particularly strong example of the interdependence among general psychology and the developmental-evolutionary perspectives.
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Mark H. Bickhard (2009) studied this question.