Date of Award


Degree Type


Degree Name

Master of Science


Health and Rehabilitation Sciences


Dr. David Purcell

Second Advisor

Dr. Prudence Allen


This manuscript provides data on contralateral suppression of distortion product otoacoustic emissions in normal hearing children and children with Auditory Processing Disorders. Listeners included children 8 to 13 years-old. DPOAEs were elicited at three test frequencies around a narrow test ratio of f2/fi = 1.1 along with the traditional f2/fi = 1.22. Results suggest a frequency effect with suppression decreasing as f2 frequency increased, and a ratio effect with greater suppression at the narrow ratio. Additionally, no significant differences existed between normal children and previously obtained adult norms for measures of maximum suppression, mean suppression and maximum/mean suppression ratio. The APD grbup however, showed greater variance in these measures than normal children, reaching significance for maximum suppression at f2 = 3 kHz and f2/fi = 1.22. The large variance of the APD population may be of clinical interest pending a better understanding of the deficits underlying the disorder.



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