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The "proportion-of-the-total-duration rule" for the discrimination of auditory patterns
1Department of Speech and Hearing Sciences, Indiana University, Bloomington 47405.
The Journal of the Acoustical Society of America
|December 1, 1992
Summary
The proportion-of-the-total-duration (PTD) rule explains how we detect changes in unfamiliar sound sequences. Auditory perception accuracy depends on a tone's duration relative to the total sequence length.
Area of Science:
- * Auditory perception
- * Psychoacoustics
- * Signal detection theory
Background:
- * Listeners must detect changes in unfamiliar auditory sequences.
- * Previous models focused on short-term memory or information capacity.
- * The role of component duration in auditory sequence perception was unclear.
Purpose of the Study:
- * To demonstrate and define the proportion-of-the-total-duration (PTD) rule.
- * To investigate how component duration influences auditory perception.
- * To test the PTD rule across various experimental conditions.
Main Methods:
- * Four experiments utilized an adaptive-tracking frequency-discrimination task.
- * Stimuli included unfamiliar sequences of tones with varying durations and numbers of components.
- * Listener performance was measured by their ability to discriminate frequency changes.
Main Results:
- * The PTD rule accurately predicted detectability based on a component's proportion of total duration.
- * This effect held across different total durations, component numbers, and individual component durations.
- * Performance was independent of the temporal position of target tones and relative context durations.
- * The rule applied to individual component durations, not cumulative durations of nonadjacent tones.
Conclusions:
- * Auditory perception of unfamiliar sequences is governed by the PTD rule.
- * Listener attention distribution, influenced by proportional duration, is key.
- * Findings challenge fixed short-term memory and information capacity limitations.