Wilson Richard H, Weakley Deborah G
James H. Quillen VA Medical Center, Mountain Home, Tennessee 37684, USA.
J Am Acad Audiol. 2005 Jun;16(6):367-82. doi: 10.3766/jaaa.16.6.5.
The purpose of this study was to determine if performances on a 500 Hz MLD task and a word-recognition task in multitalker babble covaried or varied independently for listeners with normal hearing and for listeners with hearing loss. Young listeners with normal hearing (n = 25) and older listeners (25 per decade from 40-80 years, n = 125) with sensorineural hearing loss were studied. Thresholds at 500 and 1000 Hz were < or = 30 dB HL and < or = 40 dB HL, respectively, with thresholds above 1000 Hz < 100 dB HL. There was no systematic relationship between the 500 Hz MLD and word-recognition performance in multitalker babble. Higher SoNo and SpiNo thresholds were observed for the older listeners, but the MLDs were the same for all groups. Word recognition in babble in terms of signal-to-babble ratio was on average 6.5 (40- to 49-year-old group) to 10.8 dB (80- to 89-year-old group) poorer for the older listeners with hearing loss. Neither pure-tone thresholds nor word-recognition abilities in quiet accurately predicted word-recognition performance in multitalker babble.
本研究的目的是确定对于听力正常的听众和听力损失的听众，在500赫兹多径延迟辨别（MLD）任务和嘈杂环境下的单词识别任务中的表现是协同变化还是独立变化。研究了听力正常的年轻听众（n = 25）和患有感音神经性听力损失的老年听众（年龄从40至80岁，每十年25人，n = 125）。500赫兹和1000赫兹处的听阈分别≤30分贝听力级（dB HL）和≤40分贝听力级，1000赫兹以上的听阈<100分贝听力级。在嘈杂环境下，500赫兹的多径延迟辨别与单词识别表现之间没有系统的关系。老年听众观察到更高的单耳噪声掩蔽下的阈值（SoNo）和双耳噪声掩蔽下的阈值（SpiNo），但所有组的多径延迟辨别相同。对于患有听力损失的老年听众，在嘈杂环境下以信号与噪声比衡量的单词识别平均比年轻听众差6.5分贝（40至49岁组）至10.8分贝（80至89岁组）。纯音听阈和安静环境下的单词识别能力都不能准确预测嘈杂环境下的单词识别表现。
