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Modeling phoneme perception. II: A model of stop consonant discrimination
1Research Institute for Language and Speech (OTS), University of Utrecht, The Netherlands.
The Journal of the Acoustical Society of America
|October 1, 1992
Summary
A new phoneme perception theory integrates existing models to explain speech sound discrimination. Findings show that discrimination tasks relying on labeling improve with longer intervals, while sensory trace comparisons degrade.
Area of Science:
- Cognitive Science
- Auditory Perception
- Speech Processing
Background:
- Existing theories like dual process theory (DPT) and trace context theory (TCT) offer partial explanations for speech sound discrimination.
- Understanding the temporal dynamics of speech perception is crucial for developing comprehensive models.
Purpose of the Study:
- To propose a novel phoneme perception theory integrating DPT and TCT.
- To test the proposed theory using stop-consonant and existing speech discrimination data with varying interstimulus intervals (ISI).
Main Methods:
- Development of a new phoneme perception theory with long-term phoneme memory, context-coding memory, and trace memory.
- Experimental manipulation of interstimulus interval (ISI) in stop-consonant discrimination tasks (100, 300, 2000 ms).
- Analysis of existing speech discrimination literature with ISI as a variable.
Main Results:
- Discrimination tasks involving labeling (2IFC, AX between category) showed improved performance with increased ISI.
- Discrimination tasks relying solely on sensory trace comparison (AX within category) demonstrated decreased performance with increased ISI.
- Trace context theory alone was insufficient to explain observed speech-sound discrimination data.
Conclusions:
- The proposed phoneme perception theory provides a better account of speech sound discrimination data.
- Additional mechanisms, such as sublabeling, are necessary to fully explain speech perception, requiring processing time.
- The temporal dynamics of memory components significantly influence speech sound discrimination outcomes.