Department of Experimental Medicine, Human Physiology Section, Università degli Studi di Perugia, Perugia, Italy.
Research Group Comparative Neuroscience, Leibniz Institute for Neurobiology, Brenneckestraße 6, 39118, Magdeburg, Germany.
Exp Brain Res. 2021 Apr;239(4):1223-1234. doi: 10.1007/s00221-021-06047-2. Epub 2021 Feb 15.
The study investigated how hearing depends on the whole body, head and trunk orientation relative to a sound source. In normal hearing humans we examined auditory thresholds and their ability to recognize logatomes (bi-syllabic non-sense words) at different whole body, head and trunk rotation relative to a sound source. We found that auditory threshold was increased and logatome recognition was impaired when the body or the trunk were rotated 40° away from a sound source compared to when the body or the trunk was oriented towards the sound source. Conversely, no effects were seen when only the head was rotated. Further, an increase of thresholds and impairment of logatome recognition were also observed after unilateral vibration of dorsal neck muscles that induces, per se, long-lasting illusory trunk displacement relative to the head. Thus, our findings support the idea that processing of acoustic signals depends on where a sound is located within a reference system defined by the subject's trunk coordinates.
本研究调查了听觉如何依赖于整个身体、头部和躯干相对于声源的方位。在正常听力的人类中，我们检查了在相对于声源的整个身体、头部和躯干不同旋转时的听觉阈值及其识别双音节非词（logatomes）的能力。我们发现，与身体或躯干朝向声源时相比，当身体或躯干旋转 40°离开声源时，听觉阈值会升高，并且 logatome 的识别会受损。相反，仅头部旋转时则没有观察到影响。此外，在单侧振动背颈肌肉后也观察到阈值增加和 logatome 识别受损，这会导致相对于头部的长期错觉躯干位移。因此，我们的发现支持这样一种观点，即声音信号的处理取决于声音在由主体的躯干坐标定义的参考系统中的位置。
