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Published on: June 3, 2013
The decision process in forward-masked intensity discrimination: evidence from molecular analyses
1Department of Psychology, Johannes Gutenberg-Universitat Mainz, Mainz, Germany. oberfeld@uni-mainz.de
The Journal of the Acoustical Society of America
|January 29, 2009
Summary
Listeners adapt their sound intensity discrimination strategies based on masker levels. When masker levels are equal, they favor higher levels; when unequal, they compare loudness differences to detect targets.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal detection theory
Background:
- Forward masking is crucial for understanding auditory processing.
- Intensity discrimination performance is influenced by masker variability.
- Decision strategies in auditory tasks are complex and context-dependent.
Purpose of the Study:
- To investigate listener decision strategies in a two-interval forced-choice intensity discrimination task with variable forward maskers.
- To determine how variations in masker level distribution affect listening strategies.
- To compare strategies used in intensity discrimination with those in detection tasks.
Main Methods:
- A two-interval forced-choice task was employed.
- Forward masker levels were sampled from a normal distribution with varying mean and standard deviation.
- Correlational analyses examined the relationship between masker level and interval selection.
Main Results:
- Listeners adopted an "energy detector" strategy when mean and standard masker levels were equal.
- When mean masker level exceeded the standard, listeners used a loudness-comparison strategy, favoring intervals with smaller loudness differences.
- Decision strategies differed based on the masker level distribution and task type.
Conclusions:
- Listener strategies in forward-masked intensity discrimination are adaptive and depend on masker statistics.
- Findings provide insights into auditory system's processing of masker variability.
- Results inform auditory models and highlight differences between detection and discrimination strategies.
