Delayed detection of tonal targets in background noise in dyslexia |
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Authors: | Chait Maria Eden Guinevere Poeppel David Simon Jonathan Z Hill Deborah F Flowers D Lynn |
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Affiliation: | Neuroscience and Cognitive Science Program, Department of Linguistics, University of Maryland, College Park, MD 20742-7505, USA. mariac@wam.umd.edu |
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Abstract: | Individuals with developmental dyslexia are often impaired in their ability to process certain linguistic and even basic non-linguistic auditory signals. Recent investigations report conflicting findings regarding impaired low-level binaural detection mechanisms associated with dyslexia. Binaural impairment has been hypothesized to stem from a general low-level processing disorder for temporally fine sensory stimuli. Here we use a new behavioral paradigm to address this issue. We compared the response times of dyslexic listeners and their matched controls in a tone-in-noise detection task. The tonal signals were either Huggins Pitch (HP), a stimulus requiring binaural processing to elicit a pitch percept, or a pure tone-perceptually similar but physically very different signals. The results showed no difference between the two groups specific to the processing of HP and thus no evidence for a binaural impairment in dyslexia. However, dyslexic subjects exhibited a general difficulty in extracting tonal objects from background noise, manifested by a globally delayed detection speed. |
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