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Mapping the perceptual magnet effect for speech using signal detection theory and multidimensional scaling
1Department of Speech and Hearing Sciences, University of Washington, Seattle 98195.
The Journal of the Acoustical Society of America
|January 1, 1995
Summary
Category goodness in speech perception acts like a magnet, making similar sounds harder to distinguish. This perceptual magnet effect influences how adults and infants learn languages.
Area of Science:
- Psycholinguistics
- Speech Perception
- Cognitive Science
Background:
- Category goodness of speech sounds significantly impacts perception in adults and infants.
- The perceptual magnet effect describes how prototypes of phonetic categories distort perceptual space, making neighboring sounds seem more similar.
Purpose of the Study:
- To further investigate the perceptual magnet effect in adults.
- To examine the relationship between speech sound category goodness and perceptual discrimination.
Main Methods:
- Experiment 1: Assessed goodness and identification of /i/ vowel variants.
- Experiment 2: Utilized signal detection theory (d') for bias-free discrimination assessment.
- Experiment 3: Employed multidimensional scaling (MDS) to model perceptual space distortions.
Main Results:
- High category goodness ratings correlated with reduced discrimination ability.
- Vowel tokens with high goodness were harder to discriminate and clustered more tightly in perceptual space.
- A strong relationship was found between category goodness and discrimination performance.
Conclusions:
- Findings support the existence of the perceptual magnet effect in adults.
- The perceptual magnet effect may play a role in both first and second language acquisition.
- Category goodness is a key factor influencing speech sound perception and learning.