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Conducting Concurrent Electroencephalography and Functional Near-Infrared Spectroscopy Recordings with a Flanker Task
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Asymmetric Flankers in Comodulation Masking Release.

Akram Pourbakht1, Leila Faraji1

  • 1Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.

Journal of Audiology & Otology
|August 22, 2018
PubMed
Summary

Comodulation masking release (CMR) is not affected by asymmetric flanker arrangements or by omitting higher-frequency flankers. These findings suggest CMR can be utilized with standard clinical audiometers.

Keywords:
Asymmetric flankerComodulation Masking ReleaseSymmetric flanker

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Audiology

Background:

  • Comodulation masking release (CMR) improves auditory signal detection when maskers are coherently amplitude-modulated.
  • Traditional CMR studies use symmetric flanker arrangements, which pose challenges for clinical audiometers, especially at high frequencies.

Purpose of the Study:

  • To investigate the effect of flanker arrangement on CMR.
  • To determine if asymmetric flanker configurations impact CMR, particularly when high-frequency flankers are absent.

Main Methods:

  • Eighteen normal-hearing listeners participated in the study.
  • CMR was measured using symmetric (2-2) and asymmetric (3-1, 4-0) flanker arrangements.
  • Comparisons were made between different flanker configurations.

Main Results:

  • No statistically significant differences in CMR were found between symmetric and asymmetric flanker arrangements when the total number of flankers was the same.
  • Omitting flankers with frequencies higher than the signal did not significantly alter CMR compared to symmetric arrangements.

Conclusions:

  • Flanker asymmetry does not impact CMR.
  • The absence of higher-frequency flankers does not affect CMR.
  • CMR is a viable phenomenon to consider and potentially utilize within the constraints of clinical audiometers.