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Dichotic speech tests.

M Hällgren1, M Johansson, B Larsby

  • 1Department of Neuroscience and Locomotion, Linköping University, Sweden.

Scandinavian Audiology. Supplementum
|April 21, 1999
PubMed
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See all related articles

Central auditory processing disorders impact speech comprehension in noisy environments. Dichotic speech tests revealed specific deficits in children with reading difficulties and adults exposed to organic solvents.

Area of Science:

  • Neuroscience
  • Audiology
  • Speech-Language Pathology

Background:

  • Central auditory dysfunction can impair speech understanding, particularly in challenging acoustic conditions.
  • Dichotic speech tests are valuable tools for assessing auditory processing abilities.
  • Age-related changes in auditory processing are a known factor, though not consistently observed in all studies.

Purpose of the Study:

  • To investigate the effects of central auditory dysfunction on speech perception using dichotic listening tasks.
  • To evaluate auditory processing in specific populations: children with reading/writing difficulties and adults with occupational solvent exposure.
  • To establish normative data across different age groups for comparison.

Main Methods:

  • Dichotic speech tests were administered using Swedish language stimuli, including digits, spondees, sentences, and consonant-vowel syllables.

Related Experiment Videos

  • Testing involved both free and directed reporting conditions with stimuli presented via CD.
  • Participants included a normal control group (n=30) across three age categories and two clinical groups (children with reading/writing difficulties, n=11; adults with solvent exposure, n=4).

    • Main Results:

    • No significant age-related performance differences were found in the normal control group.
    • Children with reading and writing difficulties demonstrated significant deviations on one digit and one syllable dichotic test.
    • Three out of four adults with prior organic solvent exposure exhibited significant performance deviations compared to controls.

    Conclusions:

    • Dichotic speech testing can reveal auditory processing deficits in specific clinical populations.
    • Reading and writing difficulties in children may be associated with central auditory processing impairments.
    • Occupational exposure to organic solvents could potentially lead to measurable central auditory dysfunction.