The role of upward spread of masking in the ability to benefit from asynchronous glimpsing of masked speech Public Deposited

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  • March 22, 2019
Creator
  • Ozmeral, Erol J.
    • Affiliation: College of Arts and Sciences, Department of Psychology and Neuroscience
Abstract
  • Previous studies have used asynchronous amplitude modulated (AM) maskers to investigate the ability of listeners to glimpse across frequency bands in a speech recognition task and achieve a release from masking when compared to unmodulated maskers. In general, unmasking has been achieved only when frequency bands were spectrally wide. We hypothesize that previous work failed to show glimpsing for narrower bands due to the effects of upward spread of masking (USM) at the periphery. The current study contrasted previous masking conditions with a new method aimed at eliminating the deleterious effects of USM. Specifically, we presented the even and odd numbered bands of the asynchronous AM masker and target speech to opposite ears (dichotic stimulation). In experiment 1, results showed between 5 and 8 dB more masking release in the dichotic than the diotic asynchronous AM condition. Experiment 2 tested the effect of stimulus set-size on the ability to integrate across frequency bands. Results were comparable to experiment 1 for a closed-set task, but no benefit to dichotic asynchronous AM masking was observed in an open-set task. By listening to bands in the asynchronous AM masker dichotically, subjects were able to achieve greater unmasking with narrow frequency bands than previously had been shown.
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  • In Copyright
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  • "... in partial fulfillment of the requirements for the degree of Master of Arts in the Department of Psychology."
Advisor
  • Hall, Joseph W.
Degree granting institution
  • University of North Carolina at Chapel Hill
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Place of publication
  • Chapel Hill, NC
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  • Open access
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