Executive Function Among Preschool Children: Unitary Versus Distinct Abilities

Area of Science:

• Developmental Psychology
• Cognitive Neuroscience
• Child Development

Background:

• Working memory (WM) and inhibitory control (IC) are key executive functions (EFs) in adults and adolescents.
• Evidence suggests WM and IC may not be distinct in younger children, raising questions about when these functions diverge.

Purpose of the Study:

• To investigate the emergence of distinct working memory (WM) and inhibitory control (IC) factors in preschool children.
• To test whether a two-factor model of EF fits the data better than a single-factor model in this age group.

Main Methods:

• Confirmatory factor analysis was used to analyze data from 289 preschool children (ages 45-63 months).
• A two-factor model positing separate WM and IC factors was compared against a unitary EF model.

Main Results:

• The two-factor model provided a significantly better fit than the unitary model, supporting distinct WM and IC factors.
• The correlation between WM and IC factors was higher in younger children (r=.95) than older children (r=.68), indicating increasing divergence with age.

Conclusions:

• Distinct working memory (WM) and inhibitory control (IC) factors are present in preschool children.
• These executive functions (EFs) show increasing differentiation with age during the preschool years.