Hawkins D B, Prosek R A, Walden B E, Montgomery A A
J Speech Hear Res. 1987 Mar;30(1):37-43. doi: 10.1044/jshr.3001.37.
Binaural loudness summation was measured using three different paradigms with 10 normally hearing and 20 bilaterally symmetrical high-frequency sensorineural hearing loss subjects. An adaptive paradigm and a loudness matching procedure measured summation at the lower and upper level of comfortable loudness and the loudness discomfort level (LDL). Monaural and binaural LDLs also were obtained with a clinical procedure designed to select maximum output of hearing aids. Stimuli for all three tasks consisted of 500- and 4000-Hz pure tones and a speech spectrum noise. Binaural summation increased with presentation level using the loudness matching procedure, with values in the 6-10 dB range. Summation decreased with level using the adaptive paradigm, and no summation was present with the clinical LDL task. The hearing-impaired subjects demonstrated binaural summation that was not significantly different from the normally hearing subjects. The results suggest that a bilaterally symmetrical sensorineural hearing loss does not affect binaural loudness summation. The monaural and binaural dynamic range widths were similar, and the LDL results suggest that binaural loudness summation may not be an important factor in selecting maximum output of hearing aids.
使用三种不同的范式对10名听力正常的受试者和20名双侧对称高频感音神经性听力损失受试者进行双耳响度总和测量。一种自适应范式和一种响度匹配程序测量了舒适响度的较低和较高水平以及响度不适阈（LDL）时的总和。还通过一种旨在选择助听器最大输出的临床程序获得了单耳和双耳LDL。所有三项任务的刺激包括500赫兹和4000赫兹的纯音以及语音频谱噪声。使用响度匹配程序时，双耳总和随呈现水平增加，值在6 - 10分贝范围内。使用自适应范式时，总和随水平降低，而临床LDL任务中不存在总和现象。听力受损受试者表现出的双耳总和与听力正常受试者无显著差异。结果表明，双侧对称的感音神经性听力损失不会影响双耳响度总和。单耳和双耳动态范围宽度相似，LDL结果表明双耳响度总和可能不是选择助听器最大输出的重要因素。
