Vocal tract control in XXXX : phonetic feature analysis of misarticulations.

@entity1 @entity304 @entity191 @entity51 @entity1742
Consonant articulation patterns of 200 @entity304 @entity1 were defined by two expert listeners from high fidelity tape recordings of the sentence version of the Fisher-Logemann Test of Articulation Competence (1971). Phonetic transcription and phonetic feature analysis were the methodologies used. Of the 200 @entity1 , 90 (45%) exhibited some misarticulations. Phonetic data on these 90 dysarthric @entity304 @entity1 revealed @entity1742 highly consistent in detailed production characteristics. Manner changes predominated. Phoneme classes that were most affected were the stop-plosives, affricates, and fricatives. In terms of perception features (Chomsky _ Halle, 1968), the stop-plosives and affricates, which are normally [-continuant] were produced as [+continuant] fricatives; fricatives that are [+strident] were produced as [-strident]. There is no implication, however, that @entity304 involves a perception deficit. Analysis of the @entity51 reveals inadequate tongue elevation to achieve complete closure on stop-plosives and affricates, which can be expressed in production features as a change from [+stop] to [+fricative]. There was also inadequate close constriction of the airway in lingual fricatives, which in articulatory features can be expressed as a change from [+fricative] to [-fricative]. Both the incomplete contact for stops and the partial constriction for fricatives represent an inadequate narrowing of the vocal tract at the point of articulation. These results are discussed in relation to recent EMG studies and other physiologic examinations of @entity191 .
