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Quantifying Learning in Young Infants: Tracking Leg Actions During a Discovery-learning Task
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Published on: June 1, 2015

Learning in reverse: eight-month-old infants track backward transitional probabilities.

Bruna Pelucchi1, Jessica F Hay, Jenny R Saffran

  • 1Department of Psychology and Waisman Center, University of Wisconsin - Madison, Madison, WI 53705, United States of America. pelucchi@wisc.edu

Cognition
|September 1, 2009
PubMed
Summary

Infants track backward statistics in fluent speech, demonstrating sensitivity to the direction of transitional probability. This finding offers new insights into early language acquisition and statistical learning in human infants.

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Area of Science:

  • Cognitive Science
  • Developmental Psychology
  • Linguistics

Background:

  • Human learners, including infants and adults, track sequential statistics between adjacent elements.
  • Transitional probability, a key statistic, measures the likelihood of one element predicting another.
  • The directionality of transitional probability tracking in listeners remains largely unknown.

Purpose of the Study:

  • To investigate whether 8-month-old infants are sensitive to the directionality of transitional probability in fluent speech.
  • To determine if infants can track backward transitional probabilities during word segmentation.

Main Methods:

  • An infant word segmentation task was employed using fluent speech from an unfamiliar natural language.
  • Test items were specifically designed to differ based on backward transitional probabilities.
  • The study focused on 8-month-old infants' responses to these carefully constructed speech stimuli.

Main Results:

  • Infants demonstrated sensitivity to backward transitional probabilities.
  • The results provide the first empirical evidence of infants tracking backward statistics in natural speech.
  • Infants' performance was distinguishable based on the backward transitional probabilities presented.

Conclusions:

  • 8-month-old infants can track backward transitional probabilities in fluent speech.
  • This suggests that infants utilize directional statistical information for language processing.
  • The findings contribute to our understanding of early statistical learning mechanisms in infant language acquisition.