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Central auditory processing. IV. Ear dominance--spatial and temporal complexity.

R Efron, B Koss, E W Yund

    Brain and Language
    |July 1, 1983
    PubMed
    Summary
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    Increasing sound complexity shifts ear dominance. Dichotic tone tests show a move towards right-ear advantage as frequency differences increase, suggesting complex auditory processing impacts perception.

    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Neuroscience

    Background:

    • Ear dominance in auditory perception is well-documented.
    • Previous research suggests varying factors influence hemispheric processing of auditory stimuli.

    Purpose of the Study:

    • To investigate the effect of increasing sound complexity on ear dominance.
    • To explore the relationship between frequency difference ratio (delta f/fc) and ear advantage in dichotic listening tasks.

    Main Methods:

    • Dichotic listening tests with varying frequency differences (delta f) relative to center frequency (fc) were conducted on 63 right-handed subjects.
    • The alternating tone illusion paradigm was also employed to assess ear dominance shifts.
    • Results were compared with existing literature on dichotic experiments.

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    Main Results:

    • A shift towards right-ear dominance was observed as the frequency difference (delta f) increased.
    • This effect was consistent across both the dichotic tone test and the alternating tone illusion.
    • Increased delta f/fc ratio correlated with increased subjective complexity and emergence of right-ear advantage.

    Conclusions:

    • Subjective complexity of sound images, modulated by the delta f/fc ratio, influences ear dominance.
    • Findings suggest a link between auditory complexity, anatomical asymmetries, and efferent temporal lobe mechanisms in determining ear advantage.