Chomsky [Chomsky, Noam, 1981, "Lectures on Government and Binding", Dordrecht, Netherlands, Foris Pubblications] and others have conjectured that the child might somehow exploit "indirect negative evidence": if a certain form never appears in the input, he or she might assume that it is ungrammatical, without requiring overt corrections, disapproval, evidence of comprehension failure, and so on.
- Pinker (2004), a pag.268