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Auditory intensity perception: successive versus simultaneous, across-channel discriminations.
The Journal of the Acoustical Society of America
|May 1, 1992
Summary
Simultaneous auditory intensity comparisons are superior to successive ones, especially for complex tones. This finding in auditory perception suggests noise cancellation improves simultaneous sound discrimination.
Area of Science:
- Auditory Perception
- Psychoacoustics
- Signal Detection Theory
Background:
- Human auditory system's ability to discriminate sound intensity is crucial.
- Previous research has explored intensity discrimination under various conditions.
Purpose of the Study:
- To compare the accuracy of simultaneous versus successive intensity discrimination for auditory stimuli.
- To investigate the role of stimulus complexity and frequency separation in intensity discrimination.
Main Methods:
- Three experiments were conducted using simultaneous and successive comparison paradigms.
- Stimuli included simple tones and complex tonal complexes across different frequency regions.
- Randomized overall stimulus levels encouraged within-interval comparisons.
Main Results:
- Simultaneous intensity comparisons yielded significantly better discrimination thresholds than successive comparisons.
- Threshold improvements for simultaneous comparisons were approximately 8 dB for simple tones and 15 dB for complex tones.
- Results suggest a mechanism of correlated internal noise cancellation during simultaneous presentation.
Conclusions:
- Simultaneous presentation facilitates superior auditory intensity discrimination compared to successive presentation.
- The advantage of simultaneous comparison is more pronounced for complex auditory stimuli.
- Internal noise properties, specifically correlation, play a key role in explaining the observed differences in discrimination ability.