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Related Experiment Video

Updated: Jan 12, 2026

Assessing the Coherence of Parents' Short Narratives Regarding their Child Using the Five-Minute Speech Sample Procedure

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Published on: September 19, 2019

Dynamic Interaction of Affect and Language in Children's Home Environments.

Mira L Nencheva¹, Hannah Van Dusen², Erin Watson^2,3

¹Department of Psychology, Stanford University, Stanford, California, USA.

Developmental Science

|November 7, 2025

Summary

Positive emotions and high arousal in toddlers enhance word learning. Moments with greater emotional intensity and caregiver interaction lead to better vocabulary acquisition in young children.

Keywords:

affective dynamics communication development infancy language word learning

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Published on: October 4, 2015

Area of Science:

Child Development
Developmental Psychology
Linguistics

Background:

Emotion and language are integral to young children's daily experiences.
The interplay between affective states and language acquisition in toddlers is understudied.
Understanding early communication requires examining naturalistic affective and linguistic exchanges.

Purpose of the Study:

To investigate the link between caregiver and child affect and their communication.
To explore how affect influences children's word knowledge development.
To determine if affective states facilitate word learning through enhanced communication.

Main Methods:

Utilized multiday household audio recordings of toddlers (24-30 months) and their caregivers.
Employed densely-sampled ratings of affective states (valence and arousal).
Correlated affective fluctuations with communication density and word knowledge.

Main Results:

Children were more likely to know words heard during moments of higher positive valence or arousal.
Moments with heightened affect were associated with increased caregiver-child communication density.
Positive affect and arousal appear to support word learning partly by fostering engaging communication.

Conclusions:

Affective states play a crucial role in the early language learning environment.
The interplay of emotion, communication, and vocabulary acquisition is significant for child development.
Naturalistic affective experiences are key to understanding how toddlers learn language.