Historical overview
The complement of fluid intelligence in Cattell's 1963 model, refined by Horn and Carroll into the modern CHC framework.
Scientific basis
Crystallized intelligence is distributed across temporal and parietal cortex as semantic memory. Unlike fluid intelligence, it tends to grow or remain stable into the seventies, provided neurological health is preserved.
Strengths
- Continues to accumulate across the lifespan
- Provides the schemas that make expertise possible
Limitations
- Can entrench obsolete frameworks
- Less useful when problems are genuinely novel
Relationship to other intelligence systems
Fluid Intelligence
Crystallized knowledge is what fluid reasoning operates on.
Artificial Intelligence
Pretraining is the AI analogue of crystallized intelligence.
Future implications
The boundary between human crystallized memory and externalised digital memory continues to blur as retrieval-augmented systems become ubiquitous.