National Centre for Audiology, University of Western Ontario, London, Ontario, Canada.
Int J Audiol. 2011 Aug;50(8):530-9. doi: 10.3109/14992027.2011.582167.
The purpose of this study was to evaluate changes in distortion product otoacoustic emission (DPOAE) level elicited by contralateral noise in children with normal hearing, and those with auditory processing disorders (APD) whose audiometric thresholds were normal. It was hypothesized that children with APD would demonstrate smaller changes.
Levels of DPOAEs were recorded for f(2) stimulus tones fixed at 2, 3, and 4 kHz while the f(1) tone was ramped around nominal stimulus frequency ratios of f(2)/f(1) = 1.22 and 1.10. Mean and maximum absolute changes resulting from contralateral broadband noise presented at 60 dB SPL were evaluated across the DPOAE frequency bands for each individual and for both groups of subjects.
Eight normal-hearing children and eight children with APD whose audiometric thresholds were normal participated.
There were no significant differences in DPOAE inhibition between normal hearing and APD groups, or previously recorded adult data. Mean absolute changes were typically near 1 dB, except for f(2) = 4 kHz and the stimulus frequency ratio 1.22 where inhibition was only 0.5 dB. However, there were individual children in both groups who demonstrated larger DPOAE changes for some stimulus parameters.
The inhibition of otoacoustic emissions requires further study in APD children.
本研究旨在评估正常听力儿童和听处理障碍（APD）儿童的畸变产物耳声发射（DPOAE）水平在对侧噪声刺激下的变化，这些儿童的听阈正常。假设 APD 儿童的变化会更小。
在 f(2)刺激音固定在 2、3 和 4 kHz 的情况下，记录 DPOAE 水平，而 f(1)音在标称刺激频率比 f(2)/f(1) = 1.22 和 1.10 周围变化。在每个个体和两个受试者组中，评估了在 60 dB SPL 的对侧宽带噪声下，DPOAE 频带中产生的平均和最大绝对变化。
8 名正常听力儿童和 8 名听阈正常的 APD 儿童参加。
正常听力组和 APD 组之间，或之前记录的成人数据之间，DPOAE 抑制无显著差异。平均绝对变化通常接近 1 dB，除了 f(2) = 4 kHz 和刺激频率比 1.22 外，抑制仅为 0.5 dB。然而，两个组中的个别儿童在某些刺激参数下表现出更大的 DPOAE 变化。
耳声发射的抑制需要进一步研究 APD 儿童。
