耳聋触听代偿的电生理基础实验研究  

BASIC EXPERIMENTAL RESEARCH ON ELECTROTACTILE PHYSIOLOGY FOR DEAF AUDITORY SUBSTITUTION

作　　者：王健[1] 邵庆余[1] 孙文红[1] 李新[1] 王德伟[1] 潘燕[1] 梁文革[1] 戚焰[1] 王有祥[2] 

机构地区：[1]山东医科大学生物医学工程研究室 [2]山东医科大学附属医院耳鼻喉科

出　　处：《山东医科大学学报》1997年第1期1-5,共5页Acta Academiae Medicinae Shandong

基　　金：国家自然科学基金

摘　　要：采用自制的电刺激器，微机加Ａ／Ｄ转换器构成波形发生器，对幅度感觉阈、脉宽感觉阈、脉宽分辨力、感觉适应性４项指标进行了测试。除适应性测试使用了２０个测试对象外，其它各项均有３０个测试对象。测试部位包括手指两侧、上臂、胸、背、腰、腹、耳垂。结果表明：（１）单向波幅度感觉阈高于双向波，（２）脉宽感觉动态范围８～１２ｄＢ，（３）脉宽可分辨级数为７～８，（４）触觉阈和痛阈随刺激时间的增加而增加，经过２０ｍｉｎ后，脉宽触觉阈值上升了约３．４５ｄＢ。To solve some of the fundamental psychophysical problems in the field of electrotacrile auditory substitution,a series of experiments were performed.The devices used in the experiments were made by authors.The waveform selection was based on the results of Kaczmarek et al.The electrodes were made of silver.Four items,the amplitude sensory threshold,the pulse width sensory threshold,the discriminating ability for the pulse width changes and the effect of the adaptation on pulse width threshold were evaluated.At first step,the pulse width was set at 150μs and the sensory and pain threshold of the amplitude(Is,Ip)were measured.Secondly,the amplitude was set for 1/2(IP+Is)and the thresholds of the pulse width (Ws,Wp)were measured.Defined as 20Lg(Wp/Ws),the dynamic ranges of the pulse width were also estimulated.Thirdly,the 2 channel comparison method was used to measure the discriminating ability for the step changing pulse width.Finally,a continuous stimula was used with the pulse width 150μs to investigate the changes of thresholds as the time went by.Thirty subjects were selected in these experiments except for the adaptation test that included 20 subjects.The test locations were either side of the proximal phalanx of the finger,upper arm,chest,rear,abdomen and waist.The results showed that:(1)The amplitude thresholds of monophase waveform are greater than that of the alterphase waveform.(2)The dynamic ranges of pulse width are 8 12dB.(3)The numbers of levels of pulse width that can be detected are 7 8.(4)All the thresholds increased with the stimulate duration;the sensory thresholds rose about 3.45 dB after 20 minutes of adaptation.

关 键 词：触听代偿 感觉阈 痛阈 耳聋 电生理学 

分 类 号：R764.430.2[医药卫生—耳鼻咽喉科] R338.8[医药卫生—临床医学]