“…In the first study, NG and PF vowels were produced and presented in a "neutral" context ͓͑hVb.͔ for NG vowels and ͓Vb͑.͔͒ for PF vowels͒ that minimized coarticulatory influences of preceding and following consonants, while presenting closed syllables in which both tense and lax AE vowels are allowed phonologically. Most previous studies of AE listeners' perception of German and French contrasts presented citation-form monosyllables of the form #V#, CV, or CVC ͑Best et al, 1996;Flege and Hillenbrand, 1984;Gottfried, 1984;Gottfried and Beddor, 1988;Polka, 1995;Strange et al, 2004͒ or synthetically-generated #V# or CVC syllable continua ͑Gottfried andBeddor, 1988;Rochet, 1995͒. In the studies using CV or CVC syllables, the vowels were preceded and/or followed by alveolar consonants /d, t, s/. Our recent work on the acoustic variability of AE, NG, andPF vowels ͑Strange et al, 2005, 2007͒ suggests that perception by AE listeners of back vs front, rounded NG and PF vowels may differ markedly in coronal and non-coronal contexts ͑see also Levy, 2009;Levy and Strange, 2008͒ due to the extreme allophonic fronting of AE ͓u:, *, o*͔ in coronal contexts in most dialects of AE ͑cf., Hillenbrand et al, 2001͒. Thus, results of the previous studies may not be representa-tive of assimilation of front, rounded vowels ͑or indeed other non-native vowels͒ in general.…”