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Is early word-form processing stress-full? How natural variability supports recognition.
Heather Bortfeld1, James L Morgan
1Department of Psychology, University of Connecticut, 406 Babbidge Road, Unit 1020, Storrs, CT 06269-1020, United States. heather.bortfeld@uconn.edu
Cognitive Psychology
|February 18, 2010
Summary
Mothers naturally vary word stress when speaking to infants. Infants better recognize words when the stress pattern during learning matches the stress pattern during testing.
Area of Science:
- Developmental Psychology
- Linguistics
- Speech Perception
Background:
- Mothers modify speech to infants (infant-directed speech).
- Varying word stress is a common prosodic feature in speech.
- Understanding how infants process prosody is crucial for language acquisition.
Purpose of the Study:
- To investigate mothers' natural use of word stress in infant-directed speech.
- To determine the effect of word stress on infants' word recognition in fluent speech.
Main Methods:
- Collected infant-directed speech samples with repeated target words.
- Performed acoustic analyses of word stress patterns (emphatic vs. nonemphatic).
- Utilized the headturn preference procedure to test 7.5-month-old infants' word recognition.
Main Results:
- Mothers systematically alternated between emphatic and nonemphatic stress.
- Infants showed a general preference for words with emphatic stress.
- Word recognition was highest when the degree of stress matched during familiarization and recognition.
Conclusions:
- Mothers' variable stress patterns may aid infant word learning.
- Matching stress patterns between learning and testing enhances infants' word recognition.
- Prosodic cues, like stress, play a significant role in early language development.
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