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Effects of Earplugs and Protective Headgear on Auditory Localization Ability in the Horizontal Plane

机译:耳塞和防护帽对水平飞机听觉定位能力的影响

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摘要

The purpose of this study was to determine how well humans localize sound sources in the horizontal plane while wearing protective headgear with and without hearing protection. In a source identification task, a stimulus was pre- sented from l of 20 loudspeakers arrayed in a semicircular arc, and participants stated which loudspeaker emitted the sound. Each participant was tested in 8 conditions involving various combinations of wearing a Kevlar army helmet and two types of earplugs. Testing was conducted at each of 2 orientations (frontal and lateral). In the frontal orientation, overall error was slightly greater in all protected conditions than in the bare-head control condition. In the lateral orientation, overall error score in the protected conditions was substantially and significantly greater than in the bare-head control conditions. Most errors in the lateral orientation were accounted for by front-back confusions, indicating that the protective devices disrupted high-frequency spectral cues that are the basis for discriminating front from back sound sources. The results have practical implications for the use of protective headgear and earplugs in industrial or mili- tary environments where localization of critical sounds is important.
机译:这项研究的目的是确定在佩戴带或不带听力保护装置的安全帽的情况下,人类在水平面中对声源的定位程度。在信号源识别任务中,对20个以半圆弧排列的扬声器中的1个进行了激励,参与者说出了哪个扬声器发出了声音。每个参加者在8种条件下进行了测试,涉及戴着凯夫拉尔军用头盔和两种耳塞的各种组合。在两个方向(正面和侧面)的每个方向上进行测试。在正面方向上,在所有受保护条件下的总误差比在裸头控制条件下的总误差稍大。在横向方向上,受保护条件下的总体误差得分明显高于裸头控制条件下的得分。前后方向的混淆是造成横向方向错误的主要原因,这表明保护装置破坏了高频频谱线索,而高频线索是区分前方和后方声源的基础。该结果对于在重要声音的本地化很重要的工业或军事环境中使用保护性头盔和耳塞具有实际意义。

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