Transient-evoked stimulus-frequency and distortion-product otoacoustic emissions in normal and impaired ears.
Transient-evoked stimulus-frequency and distortion-product otoacoustic emissions in normal and impaired ears.
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DOI：
10.1121/1.1904403
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发表时间：
2005-05
期刊：
影响因子：
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通讯作者：
D. Konrad‐Martin;D. H. Keefe
中科院分区：
文献类型：
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作者：
D. Konrad‐Martin;D. H. Keefe
瞬态诱发的刺激频率耳声发射（SFOAE），使用非线性微分技术记录，和畸变产物耳声发射（DPOAE）在17名听力正常和10名听力受损的科目进行了测量，使用对音调点（PP），门控音（GG），和DPOAE，连续和门控音（CG）。刺激和OAE波形的时间包络通过在刺激或DP频率下的窄带滤波获得。正常耳在2.7和4.0 kHz时的平均SFOAE潜伏期随刺激水平的增加而降低，在4.0 kHz时大于受损耳的潜伏期。通过假设耳蜗传输为最小相位，计算等效听觉滤波器带宽作为SFOAE潜伏期刺激水平的函数。DPOAE的潜伏期随水平的变化小于SFOAE的潜伏期。ppDPOAE通常有两个（或更多）峰在时间上分离，与模型预测的失真和反射分量一致。ppDPOAE潜伏期与水平的变化有时被解释为失真和反射分量的相对振幅的移位。正常耳在PIP刺激的主频谱叶内的pp SFOAE SPL在PIP的较高频率的一半中高于较低频率的一半，这可能是基底膜双音抑制的影响。
Transient-evoked stimulus-frequency otoacoustic emissions (SFOAEs), recorded using a nonlinear differential technique, and distortion-product otoacoustic emissions (DPOAEs) were measured in 17 normal-hearing and 10 hearing-impaired subjects using pairs of tone pips (pp), gated tones (gg), and for DPOAEs, continuous and gated tones (cg). Temporal envelopes of stimulus and OAE waveforms were obtained by narrow-band filtering at the stimulus or DP frequency. Mean SFOAE latencies in normal ears at 2.7 and 4.0 kHz decreased with increasing stimulus level and were larger at 4.0 kHz than latencies in impaired ears. Equivalent auditory filter bandwidths were calculated as a function of stimulus level from SFOAE latencies by assuming that cochlear transmission is minimum phase. DPOAE latencies varied less with level than SFOAE latencies. The ppDPOAEs often had two (or more) peaks separated in time with latencies consistent with model predictions for distortion and reflection components. Changes in ppDPOAE latency with level were sometimes explained by a shift in relative amplitudes of distortion and reflection components. The pp SFOAE SPL within the main spectral lobe of the pip stimulus was higher for normal ears in the higher-frequency half of the pip than the lower-frequency half, which is likely an effect of basilar membrane two-tone suppression.