Phonetic approaches to speech production in aphasia and related disorders

Reduced Coarticulation in Apraxia of Speech: Some Acoustic Evidence

“…Acquired apraxia of speech (AOS) occurs following damage to anterior portions of the language dominant hemisphere. There are varying accounts on AOS (Lebrun, 1990), but it is most often described as a disorder in the phonetic/motoric implementation of the linguistic message (Kent & McNeil, 1987;McNeil, Lisa, Tseng 8;Ryalls, 1987). The main characteristics of A05 include: inconsistent and variable articulatory movements (Hardcastle, 1987;Itch, Sasanuma & Ushijinia, 1979); increased word and vowel duration patterns (Collins, Rosenbek & Wertz, 1983;Hardcastle, 1987;Kent & Rosenbek, 1983;Skenes, 1987); a general slowed rate of speaking with resulting prolongations of transitions, segments and intersyllable pauses (Kent & Rosenhek, 1983;Snsanurna, 1971); a limited variation in relative peak intensity across syllables resulting in abnormal stress and rhythm patterns (Kent 8: Rosenhek, 1983;Sasanuma, 1971); voicing errors (Freeman, Sands & Harris.…”

“…There are varying accounts on AOS (Lebrun, 1990), but it is most often described as a disorder in the phonetic/motoric implementation of the linguistic message (Kent & McNeil, 1987;McNeil, Lisa, Tseng 8;Ryalls, 1987). The main characteristics of A05 include: inconsistent and variable articulatory movements (Hardcastle, 1987;Itch, Sasanuma & Ushijinia, 1979); increased word and vowel duration patterns (Collins, Rosenbek & Wertz, 1983;Hardcastle, 1987;Kent & Rosenbek, 1983;Skenes, 1987); a general slowed rate of speaking with resulting prolongations of transitions, segments and intersyllable pauses (Kent & Rosenhek, 1983;Snsanurna, 1971); a limited variation in relative peak intensity across syllables resulting in abnormal stress and rhythm patterns (Kent 8: Rosenhek, 1983;Sasanuma, 1971); voicing errors (Freeman, Sands & Harris. 1978;ltoh, Sasanuma, Tatsumi, Murakami, Fukusako 81 Suzuld, 1982;Kent & Rosenbek, 1983); sey'nental errors (Kent & Rosenbek, 1983); reduced ooarticulation patterns (Zeigler & von Cramon, 1985, 1986 and less coanziculatory cohesion (Chinnery, Docherty & Walshaw, 1995;Weismer & Lies, 1991;Zeigler & von Cramon, 1986).…”