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Alaryngeal speech

From Wikipedia, the free encyclopedia

Alaryngeal speech is speech using an airstream mechanism that uses features other than the glottis to create voicing. There are three types: esophageal, buccal, and pharyngeal speech. Each of these uses an alternative method of creating phonation to substitute for the vocal cords in the larynx. These forms of alaryngeal speech are also called "pseudo-voices".[1]

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Transcription

Contents

Esophageal speech

Œsophageal speech
Œ
Encoding
Entity (decimal)Œ
Unicode (hex)U+0152

Esophageal speech uses air supply to create phonation from the esophagus and pharyngo-esophageal segment to act as a replacement for the glottis. It is usually acquired following speech therapy after laryngectomy as a replacement for laryngeal speech.[2]

Buccal speech

Buccal speech
Encoding
Entity (decimal)
Unicode (hex)U+2180

This is created by producing an air bubble between the left (or right) upper jaw and the cheek that can act as an alternative "lung". The person then uses muscular action to drive the air through a small gap between or behind the teeth into the mouth. The sound so produced makes a high rough sound. This then is articulated to make speech.[3][4] It is usually acquired as a taught or self-learnt skill for entertainment. It can be used as a method of singing.[3] It is also known as Donald Duck talk[5] due to its use by Clarence Charles "Ducky" Nash for the voice of the Disney Donald Duck character.

  • sung buccal voice can have a range of three octaves (69 Hz to 571 Hz)
  • maximum duration of phonation for a series of sustained vowels is 2 seconds.
  • from most intelligible to least: glides, fricatives, plosives, affricates, and nasals.
  • on rhyme-test 76% of buccal spoken words were intelligible.
  • buccal speech is more than two octaves above that of esophageal speakers (this gives it a raised pitch compared to normal speech).

The VoQS indication for buccal speech is {ↀ}. For example, a buccal raspberry (interdental trill) can be written [ↀ͡r̪͆].

Pharyngeal speech

This is created by producing the air supply needed for phonation in the pharynx and creating a replacement for the glottis using the tongue and the upper alveolus, the palate, or the pharyngeal wall.[1][6]

In one case, pharyngeal speech was studied in a 12-year-old girl that used it as her exclusive form of speech following tracheotomy at 2 years of age.[6] Such speech was impaired in spite of ten years of her exclusive use of it for communication. Fifty percent of her time while speaking was silence. Of the other fifty percent, half was spent creating “quasiperiodic” speech-like sound and the other half spent creating noise. This produced an “unpleasant, markedly hoarse voice quality which was consistently evident in her pharyngeal speech".[6] This contrasts with skilled esophageal speakers that spend less than 20% of their time producing noise. Such speech has limited success in making some place of articulation and especially manner of articulation and voicing phonetic distinctions. There are also difficulties in creating consonant clusters and polysyllabic words.[1] Such speech was "generally well understood by immediate family members" but "reported to be largely unintelligible to outsiders".[1]

Importance

Pharyngeal speech can be produced in the early stages of learning esophageal speech. However both buccal and pharyngeal speech are less clear than trained esophageal speech and "should not be regarded as a desirable or practical primary method of alaryngeal speech".[6]

A further importance is to theories of the evolution of human speech since alaryngeal speech shows that speech is not dependent entirely upon evolved anatomy as it can be created using vocal tract anatomy in an adaptive manner.

See also

Notes

  1. ^ a b c d Khaila H, House J, Cavalli L, Nash E. (2007). A phonetic and phonological study of so-called ‘buccal’ speech produced by two long-term tracheostomised children Proceedings of the 16th International Congress of Phonetic Sciences.
  2. ^ Diedrich WM. Youngstrom KA. (1966). Alaryngeal Speech. Springfield, Ill.: Thomas OCLC 347249
  3. ^ a b Weinberg B, Westerhouse J. (1971). A study of buccal speech. J Speech Hear Res. 14(3):652-8. PMID 5163900
  4. ^ Van Gilse PHG. (1948). Another Method of Speech Without Larynx. Acta Oto-Laryngologica, 36, Supplement 78, 109 – 110. doi:10.3109/00016484809122642
  5. ^ Bleile KM. (2003). Manual of articulation and phonological disorders: infancy through adulthood. Cengage Learning ISBN 978-0-7693-0256-0 page 67
  6. ^ a b c d Weinberg B, Westerhouse J. (1973). A study of pharyngeal speech. J Speech Hear Disord. 38(1):111-8. PMID 4698378
This page was last edited on 16 January 2020, at 21:29
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