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DISTORTION-PRODUCT OTOACOUSTIC EMISSIONS IN THE COMMON MARMOSET (CALLITHRIX JACCHUS): PARAMETER OPTIMIZATION

机译:普通小猿(CALLITHRIX JACCHUS)中的失真产物耳声发射:参数优化

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摘要

Distortion-product otoacoustic emissions (DPOAEs) were measured in a New World primate, the common marmoset (Callithrix jacchus). We determined the optimal primary-tone frequency ratio (f2/f1) to generate DPOAEs of maximal amplitude between 3 – 24 kHz. The optimal f2/f1, determined by varying f2/f1 from 1.02 – 1.40 using equilevel primary tones, decreased with increasing f2 frequency between 3 – 17 kHz, and increased at 24 kHz. The optimal f2/f1 ratio increased with increasing primary-tone levels from 50 – 74 dB SPL. When all stimulus parameters were considered, the mean optimal f2/f1 was 1.224 – 1.226. Additionally, we determined the effect of reducing L2 below L1. Decreasing L2 below L1 by 0, 5, and 10 dB (f2/f1 = 1.21) minimally affected DPOAE strength. DPOAE levels were stronger in females than males and stronger in the right ear than the left, just as in humans. This study is the first to measure OAEs in the marmoset, and the results indicate that the effect of varying the frequency ratio and primary-tone level difference on marmoset DPOAEs is similar to the reported effects in humans and Old World primates.
机译:畸变产物耳声发射(DPOAE)是在新大陆灵长类动物-mar猴(Callithrix jacchus)中进行测量的。我们确定了最佳的原音频率比(f2 / f1),以生成最大振幅在3 – 24 kHz之间的DPOAE。最佳f2 / f1是通过使用相等电平的主音从1.02-1.40改变f2 / f1来确定的,随着f2频率在3-17 kHz之间的增加而降低,并在24 kHz时增加。最佳f2 / f1比随着主音电平从50 – 74 dB SPL的增加而增加。当考虑所有刺激参数时,平均最佳f2 / f1为1.224 – 1.226。此外,我们确定了将L2降低到L1以下的效果。将L2降低到L1以下0、5和10 dB(f2 / f 1 = 1.21)对DPOAE强度的影响最小。与人类一样,女性的DPOAE水平比男性要强,右耳的耳朵要比左耳强。这项研究是首次测量measure猴中OAE的研究,结果表明,改变频率比和基音水平差异对mar猴DPOAEs的影响与已报道的对人类和旧世界灵长类动物的影响相似。

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