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Hearing a mistuned harmonic in an otherwise periodic complex tone
W M Hartmann1, S McAdams, B K Smith
1Physics Department, Michigan State University, E. Lansing 48824.
The Journal of the Acoustical Society of America
|October 1, 1990
Summary
Listeners can segregate auditory streams by detecting mistuned harmonics. This ability, crucial for auditory perception, declines at high frequencies due to vanishing neural synchrony, not just spectral resolution.
Area of Science:
- Auditory Perception
- Psychoacoustics
- Neuroscience
Background:
- Auditory segregation allows distinguishing sound sources based on signal cues.
- Previous research focused on spectral resolution for auditory stream segregation.
Purpose of the Study:
- Investigate the factors influencing the ability to detect mistuned harmonics.
- Determine the relationship between neural synchrony and auditory segregation.
Main Methods:
- Listeners performed a pitch-matching task for mistuned harmonics.
- Systematic variation of harmonic number, fundamental frequency, signal level, and duration.
Main Results:
- Auditory segregation ability decreases significantly at high frequencies.
- This decline correlates with the loss of synchronous neural firing.
- Pitch shifts observed do not support models based solely on partial masking.
Conclusions:
- Neural synchrony plays a critical role in auditory segregation, alongside spectral resolution.
- The findings challenge existing models of pitch perception and auditory stream segregation.