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What kind of input is necessary for a creature that has the linguistic potential of a human being actually to realize that potential? Various scenarios are investigated on the basis of the empirical evidence available, including feral children (who receive no input and do not develop language); and creoles, twin languages, and deaf sign languages (where it seems, clearly in the case of deaf sign languages, only on certain approaches in the case of creoles, that provision of a lexicon is sufficient for the development of a fully fledged language). It is concluded that provision of a lexicon - with as its initial stage the recognition that linguistic signs can be arbitrary - plays a surprisingly important role in the minimal requirements for linguistic development, and that cognitive prerequisites must be supplemented by social ones.

From potential to realization: an episode in the origin of language