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Dichotic pitch: a new stimulus distinguishes normal and dyslexic auditory function
R F Dougherty1, M S Cynader, B H Bjornson
1University of British Columbia, Vancouver, Canada.
Neuroreport
|November 6, 1998
Summary
Dichotic pitch, a phenomenon where the brain combines sounds from both ears, is impaired in individuals with developmental dyslexia. This suggests a low-level auditory processing deficit linked to dyslexia.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Developmental Disorders
Background:
- The human auditory system can fuse filtered white noise from both ears to perceive "dichotic pitch."
- This pitch information is not present in the input to either ear individually.
Purpose of the Study:
- To develop novel dichotic pitch stimuli for psychophysical assessment.
- To investigate dichotic pitch detection in individuals with developmental dyslexia.
Main Methods:
- Generation of new, effective dichotic pitch stimuli.
- Psychophysical measurement of dichotic pitch detection thresholds.
- Comparison of detection thresholds between average readers and individuals with dyslexia.
Main Results:
- Dichotic pitch detection thresholds were significantly higher in individuals with developmental dyslexia compared to average readers.
- The novel stimuli enabled reliable assessment of dichotic pitch perception.
Conclusions:
- Developmental dyslexia is associated with a low-level auditory processing deficit affecting binaural hearing.
- The developed dichotic pitch stimuli are valuable tools for assessing auditory processing in dyslexia.