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Related Experiment Videos

Aphasia, dichotic testing and defective hearing

U Norrsell1, S Ramsing, U Rosenhall

  • 1Department of Clinical Neuroscience, Göteborg University, Sweden.

Scandinavian Journal of Rehabilitation Medicine
|March 1, 1996
PubMed
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Aphasia patients with brain lesions may experience hearing issues impacting communication. Some patients showed a left ear advantage (LEA) on dichotic tests, with some cases linked to hearing impairments or altered brain speech lateralization.

Area of Science:

  • Neurology
  • Audiology
  • Speech-Language Pathology

Background:

  • Cerebral lesions causing aphasia are frequently located near auditory processing areas.
  • Aphasia can be exacerbated by co-occurring hearing problems, often masked by communication difficulties.
  • Unilateral cerebral auditory system lesions can affect functional ear preference, as revealed by dichotic listening tests.

Purpose of the Study:

  • To investigate ear preference in aphasic patients with recent, unilateral brain infarctions using dichotic tests.
  • To determine the audiological basis for acquired left ear advantage (LEA) in this patient group.
  • To explore potential links between hearing disturbances, LEA, and cerebral speech lateralization shifts.

Main Methods:

  • Examined 114 aphasic patients with recent, unilateral brain infarctions.

Related Experiment Videos

  • Administered dichotic tests using two-syllable words to assess ear preference.
  • Conducted comprehensive audiological evaluations, including pure tone, speech, and phase-audiometry, for patients with LEA.

    • Main Results:

    • Twenty-nine out of 114 patients exhibited an acquired left ear advantage (LEA).
    • Nine of the 22 patients who underwent audiological assessment had retrocochlear or central hearing disturbances.
    • Eleven patients with LEA had no clear audiological explanation, suggesting possible compensatory shifts in cerebral speech lateralization.

    Conclusions:

    • Acquired left ear advantage (LEA) is observed in a subset of aphasic patients with unilateral brain infarctions.
    • Hearing impairments can contribute to or coexist with LEA in aphasia.
    • The absence of audiological findings in some LEA cases suggests potential alterations in brain speech processing and lateralization.