2f1-f2 distortion product otoacoustic emissions in White Leghorn chickens (Gallus domesticus): effects of frequency ratio and relative level.
2f1-f2 distortion product otoacoustic emissions in White Leghorn chickens (Gallus domesticus): effects of frequency ratio and relative level.
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白来亨鸡（Gallus Domesticus）的 2f1-f2 畸变产物耳声发射：频率比和相对水平的影响。
DOI：
10.1159/000259202
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发表时间：
1996
影响因子：
1.6
通讯作者：
Chen,L
中科院分区：
文献类型：
--
作者：
Burkard,R;Salvi,R;Chen,L
在成年白来航鸡（Gαllus Domesticus）中研究了主音频率比（f2/f1ratio）和相对电平（L2/L1）对立方差音（CDT：2f1-f2）畸变产物耳声发射（DPOAE）幅度的影响。在实验1中，研究了范围在1.05至1.8之间的9个f2/f1比。在 0.8 至 4.0 kHz 的 7 个 f1 频率下对 4 只鸡的双耳进行了测量。主音的电平相同，声压级从 20 到 80 dB 不等。一旦超过测量本底噪声，平均 CDT 幅度就会随着主音电平的增加而增加。输入/输出函数呈现两种形状之一：一种是随着主音电平的增加，DPOAE 幅度系统性增加；另一种是输入/输出函数在 65-70 dB SPL 附近出现一个平台。在最高主音电平 (80 dB SPL) 处，CDT 幅度随着 f2/f1 比率的增加而减小。在高原音水平下，产生最大 CDT 的 f2/f1 比率为 1.05 或 1.1，而在较低原音水平下，产生最大 CDT 的 f2/f1 比率为 1.2-1.3。在实验 2 中，L2 保持恒定在 70 dB SPL，L1 在 50 到 80 dB SPL 之间变化。对于 0.8 和 3.2 kHz 的 f1 频率，CDT 幅度随着 L1 的增加而增加，随后在较高水平处出现渐近线。相比之下，对于 1.6 kHz 和 2.0 kHz f1 频率，幅度增加、稳定，然后在更高水平再次增加。非正式测量表明，自发性耳声发射（SOAE）在鸡中很少见。然而，在 1 只鸡中观察到可靠的 SOAE，该 SOAE 可以被外部声音和缺氧抑制。
The effects of primary tone frequency ratio (f2/f1ratio) and relative level (L2/L1) on the amplitude of the cubic difference tone (CDT: 2f1–f2) distortion product otoacoustic emissions (DPOAEs) were investigated in adult White Leghorn chickens(Gαllus domesticus).In experiment 1, 9 f2/f1ratios ranging from 1.05 to 1.8 were investigated. Measurements were obtained from both ears of 4 chickens at 7 f1frequencies ranging from 0.8 to 4.0 kHz. The primary tones were equal in level, and varied from 20 to 80 dB SPL. The mean CDT amplitude increased with increasing primary tone level once the measurement noise floor was exceeded. The input/ output functions assumed one of two shapes: one in which there was a systematic increase in DPOAE amplitude with increasing primary tone level, and the other in which there was a plateau in the input/output function near 65–70 dB SPL. At the highest primary tone level (80 dB SPL), there was a decrease in the CDT amplitude with increasing f2/f1ratio. At high primary tone levels, the f2/f1ratio which produced the largest CDT was 1.05 or 1.1, while at lower primary tone levels the largest CDT occurred at f2/f1ratios of 1.2–1.3. In experiment 2, L2was held constant at 70 dB SPL, and L1varied from 50 to 80 dB SPL. For f1frequencies of 0.8 and 3.2 kHz, there was an increase in the CDT amplitude with increasing L1, followed by an asymptote at higher levels. In contrast, for 1.6 and 2.0 kHz f1frequencies, the amplitude increased, plateaued and then increased again at higher levels. Informal measurements suggest that spontaneous otoacoustic emissions (SOAEs) are rarely seen in chickens. However, a reliable SOAE was observed in 1 chicken, which could be suppressed by external sounds and anoxia.