噪声致听敏度提高效应  

Noise-enhanced hearing sensitivity

作　　者：龙贤明[1] 戴冀斌[2] 朱国斌[3] 龙长才[4] 

机构地区：[1]武汉大学医学院,武汉430071 [2]武汉大学医学院解剖教研室 [3]湖北省汉川市中医院耳鼻咽喉科 [4]华中科技大学物理系

出　　处：《听力学及言语疾病杂志》2005年第2期73-75,114,共4页Journal of Audiology and Speech Pathology

基　　金：国家自然科学基金资助项目 (NO :3 0 2 70 3 72 )

摘　　要：目的　探讨听觉的随机共振效应。方法　测试噪声强度在 -∞～ 14dB时听力正常的 11名受试者感知其纯音听阈附近强度纯音的能力。其中 4名接受了噪声范围在 -∞～ 2 0dB的测试。结果　当纯音强度远高于或低于被试者的听阈时 ,增加噪声并不能改善被试者的感知能力 ;当纯音强度等于或略低于被试者的听阈时 ,-∞～ 14dB的噪声能提高对纯音的感知能力。对于所测的 11名受试者 ,噪声均显示了对接近听阈的弱小纯音信号的听敏度有增强效应。结论　在特定的噪声水平 ,噪声有利于提高听阈附近强度的纯音感受的敏感性。Objective To study the effect of stoc hastic resonance on hearing sensitivity. Methods 11subjects'abilities to detect near threshold pur e tone were measured in noise levels between -∞ dB to 14 dB with normal hearing . Four of the subjects were tested.in noise intensities between -∞ dB to 20 dB. Results When the amplitude of pure tone was well above or well below measured hearing threshold, the additive noise did not affect its de tectability;When the amplitude of pure tone is equal or a little below the thres hold, the noises of -∞ dB～14 dB levels have enhancing effect on the detectabil ity.All 11 subjects showed the noise-enhanced ability of detecting near threshol d weak pure tone. Conclusion Noise does benefit human near threshold hearin g when noise level is optimal.

关 键 词：听力敏感性 噪声增强 神经非线性信号处理 

分 类 号：R764.433[医药卫生—耳鼻咽喉科]