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Masker fringe and binaural detection
R H Gilkey1, B D Simpson, J M Weisenberger
1Signal Detection Laboratory, Central Institute for the Deaf, St. Louis, Missouri 63110.
The Journal of the Acoustical Society of America
|September 1, 1990
Summary
This study examined how forward and backward noise fringes affect auditory signal detection. Results show that the timing of the signal relative to these noise fringes is crucial for its detectability.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal detection theory
Background:
- Previous research on auditory masking by noise fringes yielded conflicting results.
- Yost (1985) found no effect of a forward fringe on signal detectability, while Kollmeier and Gilkey (1990) observed masking effects.
Purpose of the Study:
- To resolve conflicting findings regarding the influence of forward and backward noise fringes on auditory signal detection.
- To systematically investigate the effect of signal onset time within a complex fringe-masker-fringe stimulus.
Main Methods:
- Investigated the detectability of a brief signal (S pi) in a masker (No) of equal duration.
- The masker was flanked by quiet, a forward fringe (N pi), or a backward fringe (N pi).
- Signal onset time was systematically varied to assess masking across the stimulus duration.
Main Results:
- The temporal relationship between the signal and the noise fringes significantly impacts signal detectability.
- Findings suggest that forward masking effects can extend beyond the masker duration under specific fringe conditions.
Conclusions:
- The presence and timing of noise fringes critically modulate auditory signal detection.
- This study clarifies the conditions under which forward masking by noise fringes influences signal perception.