Crystallized Intelligence, Fluid Intelligence, and Need for Cognition: Their Longitudinal Relations in Adolescence
Vsevolod Scherrer1, Moritz Breit1, Franzis Preckel1
1Department of Psychology, Trier University, D-54286 Trier, Germany.
Journal of Intelligence
|November 26, 2024
Summary
Cognitive development involves an interplay between fluid intelligence and need for cognition. Longitudinal data show that higher fluid intelligence boosts need for cognition, and vice versa, but crystallized intelligence is unaffected.
Area of Science:
- Psychology
- Educational Psychology
- Cognitive Science
Background:
- Investment theory posits a dynamic relationship between intelligence (crystallized and fluid) and investment traits like need for cognition.
- Existing cross-sectional research indicates positive correlations, but longitudinal studies examining these relationships over time are limited.
Purpose of the Study:
- To longitudinally investigate the reciprocal relationships between crystallized intelligence, fluid intelligence, and need for cognition in adolescents.
- To test whether initial levels of these constructs predict subsequent changes in each other.
Main Methods:
- A pre-registered longitudinal study involving 341 German students in grades 7-9.
- Data collected at two time points, one year apart.
- Analysis using multi-process latent change score models.
Main Results:
- Prior need for cognition positively predicted changes in fluid intelligence.
- Prior fluid intelligence positively predicted changes in need for cognition.
- Crystallized intelligence showed no significant longitudinal prediction from or to fluid intelligence or need for cognition.
Conclusions:
- Findings support a reciprocal, developmental interplay between fluid intelligence and need for cognition during adolescence.
- This interaction appears specific to fluid intelligence, not crystallized intelligence, challenging some theoretical assumptions.
- The results highlight the dynamic nature of cognitive investment traits and fluid intelligence growth.
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