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Binaural suppression of nonechoes.
1Speech and Hearing Research Facility, Veterans Affairs Medical Center, Martinez, California 94553.
The Journal of the Acoustical Society of America
|February 1, 1992
Summary
A diotic conditioner sound can disrupt the perceived location of a dichotic probe sound. Low-frequency conditioners are more effective at suppressing probe lateralization than higher frequencies.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Diotic conditioners disrupt dichotic probe lateralization, even with different sound types.
- Previous research established conditioner effectiveness with short intervals (4-10 ms).
Purpose of the Study:
- Investigate lateralization suppression of a 2 kHz dichotic probe by a narrow-band diotic conditioner.
- Explore effects of frequency and temporal separation on suppression.
- Determine conditions where the probe is not an echo of the conditioner.
Main Methods:
- Measured suppression as the increase in the just-noticeable interaural time difference (jnd).
- Compared probe jnd alone versus probe with conditioner.
- Varied conditioner properties: identical (opposite phase), different center frequencies (constant bandwidth ratio).
Main Results:
- Low-frequency conditioners (0.5–1.5 kHz) were more effective suppressors than those at or above the probe frequency (2 kHz).
- Suppression was observed even when the conditioner and probe had different center frequencies.
- Effects of temporal separation were explored.
Conclusions:
- Low-frequency sounds are particularly effective at suppressing the lateralization of higher-frequency sounds.
- The findings contribute to understanding auditory spatial perception and masking phenomena.