This book examines a challenging problem at the intersection of theoretical linguistics and the psychology of language: the interpretation of gradient judgments of sentence acceptability in relation to theories of grammatical knowledge. Acceptability judgments constitute the primary source of data on which such theories have been built, despite being susceptible to various extra-grammatical factors. Through a review of experimental and corpus-based research on a variety of syntactic phenomena and an in-depth examination of two case studies, Elaine J. Francis argues for two main positions. The first is that converging evidence from online comprehension tasks, elicited production tasks, and corpora of naturally-occurring discourse can help to determine the sources of variation in acceptability judgments and to narrow down the range of plausible theoretical interpretations. The second is that the interpretation of judgment data depends crucially on the theoretical commitments and assumpti
