Delayed detection of tonal targets in background noise in dyslexia  

Oleh:

Chait, Maria ; Eden, Guinevere ; Poeppel, David ; Simon, Jonathan Z. ; Hill, Deborah F. ; Flowers, D. Lynn

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 102 no. 1 (2007), page 80-90.
Topik: Dyslexia; Response times; Binaural processing; Auditory processing; Dichotic Pitch; Temporal integration; Change detection; Phonemic awareness
Fulltext: 102_01_Chait.pdf (565.11KB)

Isi artikel

Individuals with developmental dyslexia are often impaired in their ability to process certain linguistic and even basic non-linguistic auditory signals. Recent investigations report conXicting Wndings 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 Wne 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 diVerent signals. The results showed no diVerence between the two groups speciWc to the processing of HP and thus no evidence for a binaural impairment in dyslexia. However, dyslexic subjects exhibited a general diYculty in extracting tonal objects from background noise, manifested by a globally delayed detection speed.

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