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Related Experiment Video

Updated: May 22, 2026

Transcranial Direct Current Stimulation (tDCS) of Wernicke's and Broca's Areas in Studies of Language Learning and Word Acquisition
12:49

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Published on: July 13, 2019

What counts as effective input for word learning?

Laura A Shneidman1, Michelle E Arroyo, Susan C Levine

  • 1Center for Early Childhood Research, University of Chicago, IL 60637, USA. lauras@uchicago.edu

Journal of Child Language
|May 12, 2012
PubMed
Summary
This summary is machine-generated.

Children’s vocabulary growth is linked to words spoken directly to them. Input from multiple caregivers significantly boosts vocabulary, while overheard speech does not impact word learning.

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Area of Science:

  • Child Development
  • Linguistics
  • Psychology

Background:

  • Vocabulary acquisition is influenced by linguistic input from caregivers.
  • Children exposed to multiple social interactions may receive varied language input.
  • The impact of diverse linguistic environments on early word learning requires further investigation.

Purpose of the Study:

  • To examine how the number of individuals directing speech to a child affects vocabulary development.
  • To compare the predictive power of input from primary caregivers versus all household members on vocabulary size.
  • To determine if overheard speech contributes to vocabulary acquisition.

Main Methods:

  • Longitudinal study tracking children's language exposure and vocabulary size.
  • Analysis of child-directed speech from primary caregivers and other household members.
  • Statistical modeling to assess the relationship between different types of linguistic input and vocabulary growth.

Main Results:

  • The quantity of words spoken directly by primary caregivers predicted vocabulary size for all children.
  • For children with multiple social interactants, input from all household members was a stronger predictor of vocabulary than primary caregiver input alone.
  • Overheard speech did not significantly predict vocabulary size.

Conclusions:

  • Speech directed to children is a crucial factor in early vocabulary acquisition.
  • Expanding the circle of individuals directing speech to a child enhances language learning.
  • Overheard speech is not a significant contributor to a child's vocabulary development.