Exploring the Role of Medial Olivocochlear Efferents on the Detection of Amplitude Modulation for Tones Presented in Noise.
Exploring the Role of Medial Olivocochlear Efferents on the Detection of Amplitude Modulation for Tones Presented in Noise.
复制标题
探索内侧橄榄耳蜗传出神经对噪声中音调幅度调制检测的作用。
DOI：
10.1007/s10162-019-00722-6
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Torunsky,NathanT
中科院分区：
文献类型：
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作者：
Wojtczak,Magdalena;Klang,AlixM;Torunsky,NathanT
假设内侧橄榄耳蜗反射可以改善噪声背景中动态信号的检测和辨别。通过将行为结果与耳声发射进行比较来检验这一假设。在两个八度宽的噪声掩蔽器中，以 40、60 和 80 dB SPL 的水平测量前驱体对调幅 (AM) 检测的影响，该噪声掩蔽器的设计水平旨在产生较差但高于偶然的性能。使用三种类型的前驱：两个八度的噪声带、不和谐的复音和纯音。前体与紧随前体之后的同步噪声掩蔽器具有相同的总体水平。噪声前兆极大地改善了载波频率和所有三个级别的 AM 检测。复杂音调对最高级别的 AM 检测产生了类似的巨大改进，但对两个较低载波级别的影响较小。音调前兆并没有显着影响噪声中的 AM 检测。行为阈值和内侧橄榄耳蜗传出效应对用类似刺激测量的刺激频率耳声发射的比较并不支持基于传出的耳蜗反应减少有助于 AM 检测的前体效应的假设。
The medial olivocochlear reflex has been hypothesized to improve the detection and discrimination of dynamic signals in noisy backgrounds. This hypothesis was tested here by comparing behavioral outcomes with otoacoustic emissions. The effects of a precursor on amplitude-modulation (AM) detection were measured for a 1- and 6-kHz carrier at levels of 40, 60, and 80 dB SPL in a two-octave-wide noise masker with a level designed to produce poor, but above-chance, performance. Three types of precursor were used: a two-octave noise band, an inharmonic complex tone, and a pure tone. Precursors had the same overall level as the simultaneous noise masker that immediately followed the precursor. The noise precursor produced a large improvement in AM detection for both carrier frequencies and at all three levels. The complex tone produced a similarly large improvement in AM detection at the highest level but had a smaller effect for the two lower carrier levels. The tonal precursor did not significantly affect AM detection in noise. Comparisons of behavioral thresholds and medial olivocochlear efferent effects on stimulus frequency otoacoustic emissions measured with similar stimuli did not support the hypothesis that efferent-based reduction of cochlear responses contributes to the precursor effects on AM detection.