Asymmetric Flankers in Comodulation Masking Release
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Background and Objectives: Detection of auditory signals may be improved when maskersfar from the frequency of the target signal are coherently amplitude-modulated. This improvementof signal detection is called comodulation masking release (CMR). In the CMR experiments,flankers have been usually arranged symmetrically. In practice, we will be confrontedwith 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 effecton the amount of CMR, especially when there is no flankers with a frequency higher than thesignal. Subjects and Methods: Eighteen normal hearing listeners ranging in age from 20 to46 years old participated. Symmetric (2-2) and asymmetric (3-1 and 4-0) flankers were usedand then the amount of CMR compared among them. Results: Our results showed in thesame numbers of flankers, there were no statistically CMR differences between symmetricand asymmetric arrangement. Also when we did not have a flanker at a frequency higherthan the signal and all flankers were placed below the signal, there was no statistically differencewith the symmetric arrangement. Conclusions: The asymmetry of the flankers andalso 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.
Abstract
Background and Objectives: Detection of auditory signals may be improved when maskersfar from the frequency of the target signal are coherently amplitude-modulated. This improvementof signal detection is called comodulation masking release (CMR). In the CMR experiments,flankers have been usually arranged symmetrically. In practice, we will be confrontedwith 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 effecton the amount of CMR, especially when there is no flankers with a frequency higher than thesignal. Subjects and Methods: Eighteen normal hearing listeners ranging in age from 20 to46 years old participated. Symmetric (2-2) and asymmetric (3-1 and 4-0) flankers were usedand then the amount of CMR compared among them. Results: Our results showed in thesame numbers of flankers, there were no statistically CMR differences between symmetricand asymmetric arrangement. Also when we did not have a flanker at a frequency higherthan the signal and all flankers were placed below the signal, there was no statistically differencewith the symmetric arrangement. Conclusions: The asymmetry of the flankers andalso 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.
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