Abstract
This study aimed to investigate differences between ears in performance on a monaural word recognition in noise test among individuals across a broad range of ages assessed for (C)APD.Word recognition scores in quiet and in speech noise were collected retrospectively from the medical files of 107 individuals between the ages of 7 and 30 years who were diagnosed with (C)APD. No ear advantage was found on the word recognition in noise task in groups less than ten years. Performance in both ears was equally poor. Right ear performance improved across age groups, with scores of individuals above age 10 years falling within the normal range. In contrast, left ear performance remained essentially stable and in the impaired range across all age groups. Findings indicate poor left hemispheric dominance for speech perception in noise in children below the age of 10 years with (C)APD. However, a right ear advantage on this monaural speech in noise task was observed for individuals 10 years and older.
Highlights
Central auditory processing disorder, (C)APD, is a broad term that refers to a deficit in the neural processing of auditory stimuli within the central auditory nervous system (CANS)
There were no significant differences between the right and left ear word recognition score (WRS) in the quiet condition
Monaural speech tests can be used to measure the ear-specific maturation of the auditory system
Summary
Central auditory processing disorder, (C)APD, is a broad term that refers to a deficit in the neural processing of auditory stimuli within the central auditory nervous system (CANS). Individuals with (C)APD frequently report difficulty with speech perception in background noise, auditory discrimination, auditory localization, multiple direction commands (auditory memory), message comprehension, and auditory attention.[1] Because a broad range of symptoms defines (C)APD, the exact locations of the underlying neurological generators are complex and not clearly understood. Later developing auditory processes include the understanding of speech in noise and the ability to recognize degraded speech,[5] the ability to detect a small gap between two stimuli,[6] and the just noticeable difference in the localization of sound.[7] Among the broad range of (C)APD symptoms, difficulty understanding spoken language in noise is commonly reported due to underlying deficits in auditory closure, temporal processing, auditory discrimination, and binaural separation and/or integration
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