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Prosodic boundaries in alaryngeal speech.

M A van Rossum1, H Quené, S G Nooteboom

  • 1Leiden University Medical Centre, Leiden, the Netherlands. M.A.van_Rossum@LUMC.nl

Clinical Linguistics & Phonetics
|March 1, 2008
PubMed
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Alaryngeal speakers struggle with consistent prosody. While tracheoesophageal speakers use lengthening and pauses, oesophageal speakers rely mainly on pauses, impacting listener comprehension of phrase boundaries.

Area of Science:

  • Speech and Hearing Sciences
  • Linguistics
  • Acoustic Phonetics

Background:

  • Alaryngeal speakers, who have undergone larynx removal, often exhibit variable control over fundamental frequency (F0) and duration.
  • Effective communication relies on prosodic cues, such as phrase boundaries, which can be challenging for alaryngeal speakers to produce consistently.

Purpose of the Study:

  • To investigate if proficient tracheoesophageal (TE) and oesophageal (OE) speech speakers consistently signal phrase boundaries.
  • To determine if alaryngeal speakers utilize the same hierarchy of acoustic boundary cues as non-alaryngeal speakers.

Main Methods:

  • A perception experiment was conducted where listeners identified prosodic boundaries in alaryngeal speech.
  • Acoustic analyses examined pre-boundary lengthening, pitch movements, and pauses in tracheoesophageal and oesophageal speech.

Related Experiment Videos

Main Results:

  • Listeners demonstrated less accurate identification of prosodic boundaries in oesophageal speakers compared to tracheoesophageal speakers.
  • Tracheoesophageal speakers utilized pre-boundary lengthening and pauses, while oesophageal speakers primarily used pauses to mark boundaries.
  • Two oesophageal speakers produced inappropriate pauses within phrases, which were indistinguishable from prosodic pauses to listeners.

Conclusions:

  • Alaryngeal speakers' ability to convey phrase boundaries varies between speech types, with oesophageal speech posing greater challenges for listeners.
  • Specific acoustic cues like pre-boundary lengthening and pauses are employed differently by tracheoesophageal and oesophageal speakers.
  • Therapeutic interventions focusing on optimizing prosodic abilities may benefit alaryngeal speakers, particularly in mastering pause usage and boundary signaling.