Effects of stimulus intensity on sound localization in the horizontal and upper-hemispheric median plane.
Effects of stimulus intensity on sound localization in the horizontal and upper-hemispheric median plane.
复制标题
刺激强度对水平和上半球正中平面声音定位的影响。
作者：
J. Inoue
已知耳机的声音侧化能力受刺激强度的影响。然而，从刺激强度的角度对自由场中扬声器声定位的研究却很少。本研究的目的是为听力正常者和听力受损者的测试以及助听器的验配提供基础数据。作者研究了水平和上半球正中面的宽带噪声和纯音刺激强度与声音定位能力的关系。受试者为10名志愿者，5男5女，年龄18-19岁，听力正常。结果显示，以及受试者如何感知方向在所有的刺激强度。在水平平面和上半球正中平面上，对宽带噪声刺激的正确反应百分比（%正确）在强度为40至70 dB SPL（声压级）时最大，在0至20 dB SPL时最小。在较低的刺激强度下，被试即使能听到刺激，也不能判断方向。对于纯音突发刺激在上半球正中平面，%正确的是低的刺激强度无关。
Sound lateralization ability with headphones is known to be affected by stimulus intensity. However, there have been few studies on sound localization with loudspeakers in free field from the standpoint of stimulus intensity. The aim of this study is to obtain basic data for the tests with normal hearing and hearing-impaired subjects, and for the fitting of a hearing aid. The author investigated the relationship between stimulus intensities and sound localization ability of the broadband noise and pure tone bursts delivered in the horizontal and upper-hemispheric median planes. Subjects were ten volunteers, 5 males and 5 females, at the age of 18-19 years, with normal hearing. The results showed well how subjects perceived directions at all stimulus intensities. The percentage of correct response (%correct) for broadband noise stimuli was maximum at the intensity from 40 to 70 dB SPL (sound pressure level), and was minimum at 0 to 20 dB SPL in both the horizontal plane and the upper-hemispheric median plane. At lower stimulus intensity, examinee could not judge the direction, even if they could hear the stimuli. For pure tone bursts stimuli in the upper-hemispheric median plane, %correct was low irrespective of stimulus intensity.