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Related Experiment Video

Updated: Jun 27, 2025

Modeling Verbal Behavior Deficits with the Stimulus Control Ratio Equation, SCoRE

Modeling Verbal Behavior Deficits with the Stimulus Control Ratio Equation, SCoRE

Published on: May 14, 2019

How does social contingency facilitate vocabulary development?

Elena Luchkina^1,2, Fei Xu²

¹Department of Psychology, Harvard University, Cambridge, Massachusetts, USA.

Developmental Science

|May 7, 2024

Summary

This summary is machine-generated.

Parents who frequently respond to infant vocalizations support larger vocabularies. This responsiveness, not just language quantity or simplicity, appears key for early language development and understanding communication.

Keywords:

language development social contingency vocabulary growth word input

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Area of Science:

Developmental Psychology
Child Language Acquisition
Infant Communication

Background:

Parental responsiveness is linked to infant vocabulary growth.
The mechanisms driving this relationship remain unclear.
Hypotheses include increased language input, simpler input, or enhanced understanding of communication.

Purpose of the Study:

To investigate how parental social contingency influences infant vocabulary development.
To differentiate between competing hypotheses explaining the link between responsiveness and vocabulary.

Main Methods:

Analysis of naturalistic parent-infant interaction data at 9 months.
Assessment of infant receptive vocabulary at 12 months.
Statistical modeling to control for language input quantity and simplicity.

Main Results:

The frequency of parents' verbal contingent responses significantly predicted infant receptive vocabulary at 12 months.
This predictive relationship was independent of the amount of language input provided.
The simplicity of language used in contingent interactions did not explain the effect.

Conclusions:

Parental responsiveness, specifically the frequency of contingent verbal responses, is a crucial factor in early vocabulary acquisition.
Responsiveness likely enhances infants' understanding of language's communicative nature.
This enhanced communicative understanding, rather than input quantity or simplicity, drives vocabulary growth.