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Mistuning detection and onset asynchrony in harmonic complexes in Mongolian gerbils.
1Department of Biology and Environmental Sciences, Animal Physiology and Behavior Group, Carl-von-Ossietzky University Oldenburg, Postfach 2503, 26111 Oldenburg, Germany. astrid.klinge@uni-oldenburg.de
The Journal of the Acoustical Society of America
|July 24, 2010
Summary
Gerbils can detect component mistuning in complex sounds, with detection improving at higher frequencies. Temporal overlap significantly impacts their ability to discern mistuning, suggesting sophisticated auditory processing.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Animal Models
Background:
- Complex sound perception is crucial for communication.
- Understanding auditory system's ability to detect subtle changes is important.
- Previous studies established baseline auditory capabilities in Mongolian gerbils.
Purpose of the Study:
- Determine mistuning detection thresholds in Mongolian gerbils for a 200 Hz complex sound.
- Compare these thresholds with previously obtained 800 Hz complex sound data.
- Investigate the effect of temporal asynchrony on mistuning detection.
Main Methods:
- Go/NoGo paradigm used to establish frequency difference limens (FDLs).
- Varied harmonic frequency, harmonic number, and temporal onset of mistuned components.
- Simulated auditory filter processing in gerbils' peripheral auditory system.
Main Results:
- FDLs for mistuning detection decreased with increasing harmonic frequency and number (0.5% to 0.01% Weber fraction).
- Large FDLs (21% to 6.7%) observed for onset asynchronies ≥ 300 ms, indicating separate processing.
- Small FDLs similar to synchronous conditions found with ≥ 100 ms temporal overlap.
Conclusions:
- Gerbils exhibit sensitive mistuning detection across a range of frequencies.
- Temporal processing, specifically overlap duration, plays a critical role in mistuning perception.
- Phase and amplitude modulations in auditory filter outputs provide cues for sensitive mistuning detection.
