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Categorization of infant-directed speech: development from 4 to 6 months
Melanie J Spence1, David S Moore
1Box 830688, GR 4.1, The University of Texas at Dallas, Richardson 75083-0688, USA. mspence@utdallas.edu
Developmental Psychobiology
|December 10, 2002
Summary
Six-month-old infants can categorize naturalistic infant-directed speech. However, four-month-olds cannot, indicating a developmental shift in infant speech processing between four and six months of age.
Area of Science:
- Developmental Psychology
- Linguistics
- Auditory Perception
Background:
- Previous research indicated 6-month-old infants could categorize filtered infant-directed (ID) speech.
- Understanding the developmental trajectory of speech perception in infancy is crucial for cognitive development research.
Purpose of the Study:
- To investigate if 6-month-olds can categorize naturalistic, unfiltered ID speech.
- To examine the developmental progression of ID speech categorization from 4 to 6 months of age.
Main Methods:
- Experiment 1: 6-month-olds habituated to 7 unfiltered ID speech tokens, then tested with novel tokens from same/different categories.
- Experiments 2 & 4: 4-month-olds tested with filtered and unfiltered ID speech.
- Experiment 3: Assessed 4-month-olds' procedural capacity.
Main Results:
- Six-month-olds successfully categorized naturalistic ID utterances, showing recognition of novel categories.
- Four-month-olds did not categorize either filtered or unfiltered ID speech.
- Four-month-olds were capable of completing the experimental procedure.
Conclusions:
- Infants' ability to categorize naturalistic ID speech emerges between 4 and 6 months of age.
- This developmental change highlights significant advancements in auditory processing and speech perception during early infancy.