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acoustic analysis age group athetoid and spastic athetoid group athetoid speakers athetoid subjects athetosis cerebral palsy consistent hypernasality control group diphthongs dish duration of vowel extrapyramidal system frequencies fundamental frequency group mean s.d. hit Bill hit the cat individual spastic intervals between syllabic Kent maximum phonation Mean range Mean ratio mean s.d. mean measures nasal emission Netsell normal speakers O O O oo oo Posture and Control presented in Table production range of f range of means rate of syllables ratio of duration rays of best s.d. mean s.d. saw you hit sentence I took severity of dysarthria spastic and athetoid spastic group spastic speakers spastic subjects Spectrogram speech disorders speech sample standard deviation stressed vowel sustained vowels syllables per second Tongue Posture took a spoon total duration University of Wisconsin-Madison variability s.d. voice onset voice quality change voiced consonants voiceless consonants vowel preceding