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Related Experiment Videos

Selective impairment of phonation: a case study.

R C Marshall1, J Gandour, J Windsor

  • 1Audiology and Speech Pathology Service, Veterans Administration Medical Center, Portland, OR 97207.

Brain and Language
|November 1, 1988
PubMed
Summary

A stroke patient developed unusual speech issues, initially diagnosed as Broca's aphasia. However, he could speak normally using an electrolarynx, revealing a specific phonation impairment rather than aphasia.

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Area of Science:

  • Neuroscience
  • Speech-Language Pathology
  • Neurolinguistics

Background:

  • A 47-year-old man experienced a left hemisphere cerebrovascular accident (CVA) following surgery for a middle cerebral artery aneurysm.
  • Initial post-stroke symptoms presented as Broca's aphasia and apraxia of speech, affecting his language and articulation.

Observation:

  • Extensive medical, behavioral, and acoustical evaluations revealed inconsistencies with typical Broca's aphasia, apraxia of speech, and dysarthria diagnoses.
  • The patient demonstrated normal supralaryngeal articulation and absence of apraxia of speech behaviors when using an electrolarynx.
  • Utilizing an electrolarynx allowed the patient to bypass his impaired phonatory system, resulting in normal communication.

Findings:

  • The primary deficit was identified as a selective impairment of phonation, termed laryngeal apraxia.

Related Experiment Videos

  • This case demonstrates a dissociation between oral and laryngeal motor control following brain injury.
  • The findings challenge traditional diagnostic frameworks for post-stroke speech disorders.

    • Implications:

    • Suggests that specific lesions within the frontal motor association areas can lead to distinct types of apraxia.
    • Highlights the importance of differentiating phonatory deficits from broader aphasic or apraxic conditions.
    • Opens avenues for targeted therapeutic interventions for phonation impairments.