Pourbakht Akram, Faraji Leila
Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.
J Audiol Otol. 2019 Jan;23(1):27-32. doi: 10.7874/jao.2018.00192. Epub 2018 Aug 22.
Detection of auditory signals may be improved when maskers far from the frequency of the target signal are coherently amplitude-modulated. This improvement of signal detection is called comodulation masking release (CMR). In the CMR experiments, flankers have been usually arranged symmetrically. In practice, we will be confronted with a problem by using symmetric flankers due to the limited output of clinical audiometers, especially at high-frequency. We aimed to check whether flanker arrangement has any effect on the amount of CMR, especially when there is no flankers with a frequency higher than the signal. Subjects and.
Eighteen normal hearing listeners ranging in age from 20 to 46 years old participated. Symmetric (2-2) and asymmetric (3-1 and 4-0) flankers were used and then the amount of CMR compared among them.
Our results showed in the same numbers of flankers, there were no statistically CMR differences between symmetric and asymmetric arrangement. Also when we did not have a flanker at a frequency higher than the signal and all flankers were placed below the signal, there was no statistically difference with the symmetric arrangement.
The asymmetry of the flankers and also omitting the flankers with a frequency higher than the signal, have no effect on CMR results. We concluded that CMR can be considered by using clinical audiometer.
当远离目标信号频率的掩蔽声进行相干幅度调制时，听觉信号的检测可能会得到改善。这种信号检测的改善被称为共调制掩蔽释放（CMR）。在CMR实验中，侧翼声通常是对称排列的。在实际操作中，由于临床听力计的输出有限，尤其是在高频时，使用对称侧翼声会遇到一个问题。我们旨在检验侧翼声排列是否对CMR量有任何影响，特别是当没有频率高于信号的侧翼声时。受试者与方法：18名年龄在20至46岁之间的听力正常的受试者参与。使用对称（2 - 2）和不对称（3 - 1和4 - 0）侧翼声，然后比较它们之间的CMR量。结果：我们的结果表明，在侧翼声数量相同的情况下，对称和不对称排列之间在CMR上没有统计学差异。而且当我们没有频率高于信号的侧翼声且所有侧翼声都置于信号下方时，与对称排列相比也没有统计学差异。结论：侧翼声的不对称以及省略频率高于信号的侧翼声，对CMR结果没有影响。我们得出结论，使用临床听力计可以考虑CMR。
