The role of biological system other than auditory air-conduction in the emergence of the hypersonic effect
The role of biological system other than auditory air-conduction in the emergence of the hypersonic effect
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DOI：
10.1016/j.brainres.2005.12.096
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发表时间：
2006-02-16
期刊：
影响因子：
2.9
通讯作者：
Shibasaki, H
中科院分区：
文献类型：
--
作者：
Oohashi, T;Kawai, N;Shibasaki, H
虽然人类无法感知20 kHz以上频率范围内的弹性振动，但包含大量人类可听范围以上的听不见的高频成分（HFC）的非平稳声音会激活深层大脑结构，包括脑干和丘脑，并引起各种生理，心理和行为反应。在以前的报告中，我们把这些现象统称为“高超音速效应”。“然而，目前尚不清楚，如果振动刺激以上的可听范围是通过传统的空气传导听觉系统转换和感知，或者如果其他机制也有助于介导的转换和感知。在本研究中，我们已经研究了高超音速效应的出现时，听不见的HFC和可听的低频成分（LFC）有选择地提出的耳朵，一个空气传导的听觉系统的入口，或到身体表面，包括头部，其中可能包含一些未知的振动传感机制。我们使用了两种基于不同原理的独立测量;一种是生理学（自发脑电图的α 2频率[alpha-EEG]），另一种是行为学（舒适听力水平[CLL]）。只有当听者的整个身体表面暴露于HFC时，而不是当HFC仅呈现给空气传导听觉系统时，与单独呈现LFC相比，alpha-EEG和CLL都显著增加，也就是说，有明显的高超音速效应出现。本研究结果表明，传统的空气传导听觉系统单独不会带来高超音速效应。我们可能需要考虑的可能参与的生物系统不同于传统的空气传导听觉神经系统在感知和转换高频弹性振动高于人类听觉范围。(c)2005 Elsevier B. V.保留所有权利。
Although human beings cannot perceive elastic vibrations in the frequency range above 20 kHz, nonstationary sounds containing a wealth of inaudible high-frequency components (HFC) above the human audible range activate deep-lying brain structures, including the brainstem and thalamus and evoke various physiological, psychological, and behavioral responses. In the previous reports, we have called these phenomena collectively "the hypersonic effect." It remains unclear, however, if vibratory stimuli above the audible range are transduced and perceived solely via the conventional air-conducting auditory system or if other mechanisms also contribute to mediate transduction and perception. In the present study, we have examined the emergence of the hypersonic effect when inaudible HFC and audible low-frequency components (LFC) were presented selectively to the ears, the entrance of an air-conducting auditory system, or to the body surface including the head which might contain some unknown vibratory sensing mechanisms. We used two independent measurements based on differing principles; one physiological (alpha 2 frequency of spontaneous electroencephalogram [alpha-EEG]) and the other behavioral (the comfortable listening level [CLL]). Only when the listener's entire body surface was exposed to HFC, but not when HFC was presented exclusively to the air-conducting auditory system, did both the alpha-EEG and the CLL significantly increase compared to the presentation of LFC alone, that is to say, there was an evident emergence of the hypersonic effect. The present findings suggest that the conventional air-conducting auditory system alone does not bring about the hypersonic effect. We may need to consider the possible involvement of a biological system distinct from the conventional air-conducting auditory nervous system in sensing and transducing high-frequency elastic vibration above the human audible range. (c) 2005 Elsevier B.V. All rights reserved.