Freyaldenhoven Melinda C, Plyler Patrick N, Thelin James W, Hedrick Mark S
Louisiana Tech University, Department of Speech, P.O. Box 3165, Ruston, LA 71272, USA.
J Speech Lang Hear Res. 2007 Aug;50(4):878-85. doi: 10.1044/1092-4388(2007/062).
To compare the effects of speech presentation level on acceptance of noise in listeners with normal and impaired hearing.
Participants were listeners with normal (n = 24) and impaired (n = 46) hearing who were matched for conventional acceptable noise level (ANL). ANL was then measured at 8 fixed speech presentation levels (40, 45, 50, 55, 60, 65, 70, and 75 dB HL) to determine if global ANL (i.e., ANL averaged across speech presentation levels) or ANL growth (i.e., the slope of the ANL function) varied between groups.
The effects of speech presentation level on acceptance of noise were evaluated using global ANLs and ANL growth. Results showed global ANL and ANL growth were not significantly different for listeners with normal and impaired hearing, and neither ANL measure was related to pure-tone average for listeners with impaired hearing. Additionally, conventional ANLs were significantly correlated with both global ANLs and ANL growth for all listeners.
These results indicate that the effects of speech presentation level on acceptance of noise are not related to hearing sensitivity. These results further indicate that a listener's conventional ANL was related to his or her global ANL and ANL growth.
比较言语呈现水平对听力正常和听力受损听众噪声接受度的影响。
参与者为听力正常（n = 24）和听力受损（n = 46）的听众，他们在传统可接受噪声水平（ANL）上进行了匹配。然后在8个固定的言语呈现水平（40、45、50、55、60、65、70和75 dB HL）下测量ANL，以确定总体ANL（即跨言语呈现水平平均的ANL）或ANL增长（即ANL函数的斜率）在两组之间是否存在差异。
使用总体ANL和ANL增长来评估言语呈现水平对噪声接受度的影响。结果显示，听力正常和听力受损的听众在总体ANL和ANL增长方面没有显著差异，并且对于听力受损的听众，两种ANL测量方法均与纯音平均值无关。此外，对于所有听众，传统ANL与总体ANL和ANL增长均显著相关。
这些结果表明，言语呈现水平对噪声接受度的影响与听力敏感度无关。这些结果进一步表明，听众的传统ANL与其总体ANL和ANL增长有关。
