Ann Rehabil Med.  2011 Oct;35(5):694-700. 10.5535/arm.2011.35.5.694.

Voice Onset Time Variations of Korean Stop Consonants in Aphasic Speakers

Affiliations
  • 1Department of Speech & Rehabilitation, Hyejeon University, Hongseong 350-702, Korea.
  • 2Department of Physical Medicine and Rehabilitation, Chonbuk National University Medical School, Jeonju 561-180, Korea. mhko@chonbuk.ac.kr
  • 3Department of Clinical Speech Pathology, Chonbuk National University, Jeonju 561-180, Korea.

Abstract


OBJECTIVE
To compare the voice onset time (VOT) differences of Korean stops in the initial and intervocalic positions between the aphasic patients with peculiarities of aspiration and a control group. METHOD: We examined 15 aphasic patients (nine males, six females) who had suffered a stroke (average age 49.7 years) and 15 healthy controls (average age 47.4 years). An aphasia examination was made by an aphasia battery of three standard tests and VOT was analyzed instrumentally. Stop consonants in the initial and intervocalic position were measured to categorize them according to aphasia types, place of articulation, and manner of articulation.
RESULTS
VOT of the aphasic patients with peculiarities of aspiration had a greater difference than that of the controls, indicating that the temporal non-coordination between the laryngeal adjustment and oral articulators of aphasic patients happens due to the VOT of stops in the initial and intervocalic positions (p<0.05).
CONCLUSION
VOT of stop consonants in the initial position produced by aphasic patients tends to be proportional to their breathing. It can cause glottal width and make aphasic patients' VOT duration longer. Lastly, the method to measure the VOT of aphasic patients is more significant for the types of phonation than for the places of articulation, and makes it possible to induce abnormal VOT.

Keyword

Voice onset time; VOT; Aphasia; Korean stop consonant

MeSH Terms

Aphasia
Dental Articulators
Humans
Hypogonadism
Male
Mitochondrial Diseases
Ophthalmoplegia
Phonation
Respiration
Stroke
Voice
Hypogonadism
Mitochondrial Diseases
Ophthalmoplegia

Figure

  • Fig. 1 Relative comparison of VOT, VD duration and lead time between aphasic patients (A) and normal controls (B). These figures indicate that VOT, VD duration and lead time of aphasic patient are longer than those of normal control (VD: vowel duration, a: initial VOT, b: initial vowel duration, c: hold, d: lead time, e: second vowel duration, f: total duration).

  • Fig. 2 Comparison of (A) phonation types and (B) articulation positions. Phonation types were significantly showed differences than articulation positions compared with normal control group.


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