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Dichotic spectral integration range for consonant recognition in listeners with normal hearing
1Laboratory of Translational Auditory Research, Department of Communication Sciences and Disorders, Baylor University, Waco, TX, United States.
Frontiers in Psychology
|November 7, 2022
Summary
The dichotic spectral integration range (DSIR) shows that consonant recognition is possible even with missing spectral information when complementary data is integrated across ears. DSIR is consonant-specific and consistent, aiding in understanding minimal spectral needs for hearing.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Speech Perception
Background:
- The dichotic spectral integration range (DSIR) quantifies the frequency range required in one ear for consonant recognition, given complementary low-frequency information in the other ear.
- Understanding DSIR is crucial for speech perception research, particularly in scenarios with limited auditory information.
Purpose of the Study:
- To measure the DSIR for consonant recognition in normal-hearing listeners under various signal processing conditions.
- To investigate how low-frequency information and signal processing affect the DSIR.
- To determine consonant-specific DSIR requirements.
Main Methods:
- Listeners performed consonant recognition tasks under dichotic listening conditions.
- Stimuli were processed with low-pass filters (250-1000 Hz in one ear) and high-pass filters (adaptively adjusted in the other ear).
- Three signal processing conditions were applied: unprocessed, intensified target regions, and intensified target minus conflicting regions.
Main Results:
- Mean DSIRs varied depending on the amount of low-frequency information, generally requiring mid-to-high frequencies.
- DSIRs narrowed with increased low-frequency input, indicating reduced spectral needs.
- Signal processing minimally affected DSIR, except at a 250 Hz low-pass cutoff. Specific consonants (/ta/, /da/, /sa/, /za/) required smaller DSIRs than others (/ka/, /ga/, /fa/, /va/).
- DSIR was consonant-specific and consistent across most conditions.
Conclusions:
- Consonant recognition can occur with substantial spectral information loss if complementary spectral data is integrated across ears.
- DSIR is a reliable measure, specific to individual consonants, and largely independent of the tested signal processing techniques.
- Findings provide insights into the minimum spectral bandwidth necessary for consonant recognition with limited contralateral spectral input.
Keywords:
articulation-index grambinaural integrationconsonant recognitiondichotic hearingspectral integrationMore Related Videos
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