Phonological constraints can, in principle, be classified according to whether they are natural (founded in principles of universal grammar (UG)) or unnatural (arbitrary, learned inductively from the language data). Recent work has used this distinction as the basis for arguments about the role of UG in learning. Some languages have phonological…

Research on which portions of this study are based was performed under a National Science Foundation Grant and a grant from the National Endowment for the Humanities. (VM)

This study presents evidence for the psychological reality of the Subset Principle as a determinant of the acquisition of Governing Category Parameter settings for English anaphors and pronominals. Prelingual deafness was used as a natural experiment in the acquisition of English in the presence of variably impaired access to English language…