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The Dichotic Digits difference Test (DDdT): Development, Normative Data, and Test-Retest Reliability Studies Part 1.

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    The Dichotic Digits difference Test (DDdT) helps distinguish children with central auditory processing disorder from those with cognitive deficits. High correlation between dichotic and diotic tasks suggests cognitive factors significantly impact dichotic listening performance.

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    Area of Science:

    • Audiology
    • Neuroscience
    • Cognitive Psychology

    Background:

    • The dichotic digits test is a common tool for assessing central auditory processing disorder (CAPD).
    • Cognitive factors' influence on dichotic test results requires further investigation.

    Purpose of the Study:

    • To develop the Dichotic Digits difference Test (DDdT) for differentiating children with cognitive deficits from those with genuine dichotic deficits.
    • The DDdT includes subtests for dichotic free recall (FR), dichotic directed left ear (DLE), dichotic directed right ear (DRE), and diotic listening.

    Main Methods:

    • Experiment 1: DDdT development and error rate analysis in adults.
    • Experiment 2: Normative data collection and test-retest reliability study in children and adults.
    • Data analysis included arcsine transformation, z-score calculation, and Pearson correlations.

    Main Results:

    • Adult development study showed no significant test-retest differences.
    • Error rates for digit pairs ranged from 1.5% to 16.7%.
    • In children, dichotic free recall (FR) processing strongly correlated with diotic processing (r=0.5-0.6, p<0.0001).

    Conclusions:

    • The DDdT, with its diotic control, can differentiate children with poor dichotic processing from those with cognitive impairments.
    • High correlation between dichotic and diotic performance indicates significant influence of cognitive factors on dichotic listening.
    • Further investigation into cognitive correlations is warranted (as explored in the companion paper).