Evidence for phonological grammar in speech perception Elliott Moreton This paper presents evidence from two experiments 1. that speakers of English use the phonotactics of English in analyzing speech input, and 2. that their phonotactic knowledge takes the form of categorical constraints stated in terms of phonological categories. Experimental results indicate that the phonotactic effect on ambiguous-segment perception is influenced by the relative markedness of the endpoints, but not by their relative frequency. [In: J. J. Ohala, Y. Hasegawa, M. Ohala, D. Granville, and A. C. Bailey (eds.), Proceedings of the 14th International Congress of Phonetic Sciences, San Francisco, pp. 2215-2217]