Not all executive functions are related to intelligence.

Area of Science:

• Cognitive Psychology
• Neuroscience

Background:

• Executive functions (EFs) are increasingly linked to intelligence.
• However, EFs are not a unitary construct, necessitating investigation into their differential relations with intelligence.

Purpose of the Study:

• To examine the relationship between fluid and crystallized intelligence (measured by Wechsler Adult Intelligence Scale IQ) and three distinct EFs: inhibiting prepotent responses, shifting mental sets, and updating working memory.
• To determine if intelligence measures differentially relate to these specific executive functions.

Main Methods:

• Participants: Young adults.
• Measures: Fluid and crystallized intelligence (Wechsler Adult Intelligence Scale IQ), inhibiting, shifting, and updating working memory tasks.
• Analysis: Correlational analyses and structural equation modeling to control for inter-EF correlations.

Main Results:

• Updating working memory showed a strong correlation with intelligence measures.
• Inhibiting and shifting mental sets were not significantly correlated with intelligence.
• Structural equation models confirmed updating's strong relation to intelligence, while inhibiting and shifting showed minimal, non-significant associations.

Conclusions:

• Intelligence measures are differentially related to specific executive functions.
• Current intelligence assessments may not comprehensively evaluate the range of executive control abilities crucial for intelligent behavior.
• Further research is needed to understand the nuanced relationship between diverse executive functions and intelligence.