Related Experiment Videos
Detection and intensity discrimination of a sinusoid
The Journal of the Acoustical Society of America
|November 1, 1986
Summary
This study found that Weber's law generally holds for sound intensity discrimination, even at low levels. Performance differences in quiet versus noise suggest distinct underlying variability mechanisms.
Area of Science:
- Auditory perception
- Psychoacoustics
- Sensory neuroscience
Background:
- Understanding intensity discrimination is crucial for auditory perception.
- Weber's law is a fundamental principle in psychophysics, but its applicability at low sound levels requires investigation.
Purpose of the Study:
- To measure intensity discrimination thresholds for tones at various sound pressure levels (SPL).
- To examine the validity of Weber's law at low sensation levels (SL).
- To compare auditory performance in quiet versus broadband noise conditions.
Main Methods:
- Measured intensity discrimination thresholds for gated 100-ms, 1000-Hz tones.
- Obtained psychometric functions for discrimination and signal detection in quiet.
- Replicated conditions in the presence of continuous broadband noise.
Main Results:
- Weber's law was approximately valid down to 0 dB SL.
- Negative masking was observed, even when expressed as increment energy.
- Discrimination psychometric functions were shallower than detection functions.
- Performance in noise generally agreed with quiet, but suggested different limiting variability.
Conclusions:
- Weber's law is applicable to sound intensity discrimination at low levels.
- Auditory processing in quiet and noise may involve different sources of variability.
- Findings inform models of auditory perception, including nonlinear transduction and uncertainty effects.