Related Experiment Videos
Upward shifts in the masking pattern with increasing masker intensity
The Journal of the Acoustical Society of America
|October 1, 1983
Summary
Forward masking patterns depend on temporal parameters. Longer signals and masker-to-signal intervals cause upward shifts in masking patterns with increased masker intensity, unlike shorter durations.
Area of Science:
- Auditory perception
- Psychoacoustics
- Hearing science
Background:
- Forward masking reveals auditory system's temporal processing.
- Masking patterns can shift in frequency with masker intensity.
- The 'half-octave shift' in auditory fatigue is a related phenomenon.
Purpose of the Study:
- To investigate how temporal parameters influence forward masking patterns.
- To determine if masker intensity-dependent frequency shifts in masking occur consistently.
- To explore the relationship between these shifts and traveling wave envelope displacement.
Main Methods:
- Utilized forward-masking paradigms with varying signal and masker-to-signal interval durations.
- Employed a 2000-Hz tone and maskers of increasing intensity (65-95 dB SPL).
- Tested a 750-Hz masker to assess frequency specificity.
Main Results:
- A 2000-Hz tone showed upward frequency shifts in masking patterns with increased masker intensity when long signals (50 ms) and intervals (50 ms) were used.
- This upward shift was reduced or absent with short signals and intervals.
- No significant upward shift was observed with a 750-Hz masker.
Conclusions:
- Temporal parameters critically affect forward masking patterns.
- Upward frequency shifts in masking correlate with basalward migration of traveling wave envelope displacement.
- Findings support existing theories on auditory processing and fatigue phenomena.