Contribution of click frequency bands to the human binaural interaction components.

A Polyakov, H Pratt
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引用次数: 6

Abstract

The purpose of this study was to determine the contribution of click frequency bands (broad-band, >2000 Hz, <2000 Hz and <1000 Hz) to binaural interaction components (BICs) of the human auditory brainstem evoked potentials (ABEPs). The human BICs were studied by subtracting the potentials to binaural clicks from the algebraic sum of monaurally evoked potentials to either ear. Effective frequency bands were derived using clicks alone or clicks with ipsilateral or binaural masking noise, high- or low-pass filtered at different cut-off frequencies. Analysis included single-channel vertex-cervical spinous process VII derivation of BIC and ABEP, as well as estimating the single, centrally located dipole equivalent of the surface activity from three orthogonally positioned electrode pairs, using the three-channel Lissajous' trajectory (3-CLT) analysis. All BIC 3-CLTs included three major components (labeled BdII, BeI, and BeII) approximately corresponding in latency to IIIn, V and VI ABEP peaks. All apex latencies of BIC 3-CLT, except BeI, were longer in response to <2000 Hz and <1000 Hz (low-frequency) effective clicks. Apex amplitude of components BeI and BeII of BIC 3-CLT were smaller with low-frequency effective clicks than with broad-band or high-frequency (>2000 Hz) clicks. We suggest that binaural interaction component BeI is mainly tuned to high frequencies, showing no frequency effect on latency, and decreasing in amplitude with decreasing click high frequency content. In contrast, BdII and BeII of the human BICs are evoked more synchronously by high-frequency binaural inputs, but are also sensitive to low frequencies, increasing in latency according to the cochleotopic activation pattern. These differences between BIC components may reflect their roles in sound localization.

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点击频带对人双耳交互分量的贡献。
本研究的目的是确定点击频带(宽带,>2000 Hz, 2000 Hz)的贡献。我们认为双耳交互分量BeI主要被调谐到高频,对延迟没有频率影响,并且振幅随着点击高频内容的减少而减小。相比之下,人类bic的BdII和BeII被高频双耳输入更同步地激发,但对低频也很敏感,根据耳蜗异位激活模式,潜伏期增加。BIC成分之间的这些差异可能反映了它们在声音定位中的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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