Temporal and spectral aspects of coarticulation in ataxic dysarthria: An acoustic analysis

In order to analyze the impact of cerebellar disorders on temporal and spec tral aspects of coarticulation, 9 individuals with cerebellar dysfunction a nd 9 controls were asked to produce test sentences comprising a target vowe l (V = [a], [i], or [u]) within a schwa-t-V-t-schwa environment. The contro l speakers were investigated both at their habitual speech tempo and under a slow speaking condition. The squared distances between averaged FFT spect ra served as a quantitative estimate of target-induced coarticulation, a me thod that can be applied to consonants as well as vowels, and which avoids the shortcomings of formant analysis. In order to test the significance of coarticulation effects at the level of individual speakers and to obtain F values as a further measure of the strength of coarticulation,multivariate tests of target effects were performed, with the first 6 principal componen ts derived from the spectra of each speaker. First, inconsistent patterns o f anticipatory vowel-to-vowel (VV) interactions emerged across individuals, and neither significant group differences nor any effects of speech rate c ould be detected. The underlying control mechanisms thus seem to be segment -linked subject-specific specifications of the pretarget vowel, uncompromis ed by cerebellar dysfunction. Second, all participants exhibited highly sig nificant anticipatory [t(h)]-to-vowel (CV) coarticulation. This effect was slightly smaller in the cerebellar group than in the control group, which c an be at least partially explained by reduced spectral distances among the 3 target vowels. speech rate did not influence the CV effects of the contro l group. As concerns temporal aspects of coarticulation, no significant gro up differences emerged in terms of length adjustments of the pretarget cons onant to the intrinsic duration of the target vowel. Third, ataxic speakers showed a tendency toward enlarged perseverative vowel-to-[t(h)] (VC) and V V effects if their slow speech rate was taken into account. Retentive coart iculation turned out to be similar in slow ataxic speakers and in fast-spea king controls. However, significant attenuation of these effects emerged in the latter group under the condition of decreased speech tempo. In summary , these results corroborate the suggestion of different mechanisms of gestu ral overlap in the temporal domain: Whereas perseverative coarticulation, p resumably, reflects biomechanical or motor constraints, anticipation seems to represent higher level phonetic processing.