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KMID : 0917520000070010077
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Journal of Speech Sciences
2000 Volume.7 No. 1 p.77 ~ p.87
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The Latency of Distortion Product Otoacoustic Emissions in Ears with Hearing Impairment
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Lee, Jung Hak
Cho, Soo Jin/Kim, Jin Sook
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Abstract
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Distortion Product Otoacoustic Emissions (DPOAEs) can be measured in the external ear canal two fold: amplitude and latency, but most DPOAE studies deal with amplitude aspects. The purpose of this study was to investigate the latency of the 2f1-f2 DPOAEs in ears with hearing losses and to see if it could be a clinically useful method to distinguish normal from abnormal ears. For this purpose, DPOAE latency were measured as a function of frequency from 1 to 8 kHz in 30 ears with conductive and sensorineural hearing losses (SNHLs). DPOAEs were recorded with Otodynamic Analyzer ILO92. Results showed that the latency for ears of SNHLs wrer shorter at all frequencies when they were compared to the mean values of normal ears. The latency in ears of conductive hearing losses was shorter than normal ears at the selective frequencies, as well. The results support the hypothesis that latency values are shorter in pathological ears.
Keywords : DPOAEs, DPOAE latency, Conductive hearing loss, SNHL.
The primary goal of the present study was to explore the effects of hearing impaired, conductive and sensorineural hearing losses, on DPOAE latencies. 30 ears, 20 ears with mild to moderate sensorineural hearing loss and 10 ears with mild to moderate conductive hearing loss were examined using a phase gradient method. Similar to the normal DPOAE latency, the overall DPOAE latency pattern revealed a decrease in latency as the stimulus frequency increased. The latency values of the damaged ears were much shorter than those of the normal ears. The available data supports the hypothesis that latency would be decreased in pathological ears. This certainly suggests that further investigation of this hypothesis is warranted.
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