Kumar U Ajith, Vanaja C S
Department of Audiology, All India Institute of Speech & Hearing, Mysore, Karnataka, India.
Ear Hear. 2004 Apr;25(2):142-6. doi: 10.1097/01.aud.0000120363.56591.e6.
To evaluate the effect of contralateral acoustic stimuli on speech identification scores and to correlate this effect to contralateral suppression of evoked otoacoustic emission.
Ten normal-hearing children with good academic performance participated in the study. Speech identification scores were measured in quiet and with different ipsilateral signal to noise ratios in two conditions, with and without contralateral acoustic stimuli. Transient evoked otoacoustic emissions were recorded for 70 dB SPL clicks with and without contralateral acoustic stimuli.
Findings revealed that contralateral acoustic stimuli enhanced speech perception when ipsilateral signal to noise ratios was +10 dB and +15 dB. This enhancement had significant positive correlation with contralateral suppression of OAE.
The results of the present study support the hypothesis that medial olivocochlear bundle might aid in speech perception in noise, thereby suggesting a possible role of cochlear efferent fibers in hearing. The psychoacoustic measures can be used to evaluate the efferent auditory pathways, where it is not possible to record otoacoustic emissions.
评估对侧听觉刺激对言语识别分数的影响，并将该影响与对侧诱发耳声发射的抑制相关联。
十名听力正常、学业成绩良好的儿童参与了该研究。在安静环境以及两种条件下（有无对侧听觉刺激）、不同同侧信噪比的情况下测量言语识别分数。在有和没有对侧听觉刺激的情况下，记录70 dB SPL短声诱发的瞬态耳声发射。
研究结果显示，当同侧信噪比为+10 dB和+15 dB时，对侧听觉刺激增强了言语感知。这种增强与对侧耳声发射抑制呈显著正相关。
本研究结果支持以下假设，即内侧橄榄耳蜗束可能有助于噪声环境下的言语感知，从而提示耳蜗传出纤维在听力中可能发挥的作用。心理声学测量可用于评估无法记录耳声发射的传出听觉通路。
