Assimilation nasality patterns for high, mid and low vowels were studied in two dialects of North American English (Canadian & southeastern American). Native speakers (n=24) produced CVC, NVC, CVN and NVN tokens. The vowel portion of each oral and nasal acoustical signal was transduced by a Nasometer, digitized, and the degree of nasalance established as: % nasalance = nasal rms/(nasal + oral r...