Sreedhar Adithya, Prakash Praveen, Umashankar Abishek, Prabhu Prashanth
Department of Audiology, All India Institute of Speech and Hearing Mysuru, Naimisham Campus, Road No. 3 TK Layout, Manasagangotri, Mysuru, Karnataka 570006 India.
Indian J Otolaryngol Head Neck Surg. 2022 Dec;74(Suppl 3):4100-4105. doi: 10.1007/s12070-021-02852-x. Epub 2021 Sep 12.
The aim of the article was to compare the conditions of silent and contralateral noise on Differential sensitivity in normal hearing individuals. A total of 40 participants (20 males and 20 females) were enrolled in the study with a mean age of 21.7 years, participants with normal hearing thresholds and no history of middle ear pathology were enrolled for the study. Difference limen tests such as difference limen for intensity (DLI), difference limen for frequency (DLF), and difference limen for time (DLT) were carried out in these 40 individuals in the two conditions of silent and contralateral noise using MATLAB. Statistical analysis was carried out using the SPSS version 25.0 were descriptive and inferential statistics were carried out. Data was normally distributed on the Shapiro-Wilk's test of normality due to which a paired t test was carried out to establish the nature of significance between the silent and contralateral noise condition. Results reveal the presence of significant difference ( < 0.01) between the groups for DLF and DLT with contralateral noise condition performing better than silent condition for the parameters. However, no significant difference was obtained for DLI. There is a positive effect of the efferent auditory pathway on the Differential sensitivity thus implying that speech perception in noise is improved in the presence of background noise for normal hearing individuals due to this effect. But in case of DLI, the reduced spread of excitation could be the reason why there were no significant differences between silent and contralateral noise condition.
本文的目的是比较正常听力个体在安静和对侧噪声条件下的辨别灵敏度。共有40名参与者（20名男性和20名女性）参与了该研究，平均年龄为21.7岁，纳入研究的参与者听力阈值正常且无中耳疾病史。使用MATLAB在这40名个体的安静和对侧噪声两种条件下进行了差异阈测试，如强度差异阈（DLI）、频率差异阈（DLF）和时间差异阈（DLT）。使用SPSS 25.0版本进行统计分析，进行了描述性和推断性统计。数据在Shapiro-Wilk正态性检验中呈正态分布，因此进行了配对t检验以确定安静和对侧噪声条件之间的显著性性质。结果显示，对于DLF和DLT，两组之间存在显著差异（<0.01），对侧噪声条件下的参数表现优于安静条件。然而，DLI未获得显著差异。传出听觉通路对辨别灵敏度有积极影响，这意味着由于这种影响，正常听力个体在存在背景噪声的情况下语音感知得到改善。但对于DLI，兴奋扩散的减少可能是安静和对侧噪声条件之间没有显著差异的原因。
