Raymond Cattell was a
prominent American
psychologist known for his
research on intelligence and
personality. He introduced
the concepts of "fluid
intelligence" and
"crystallized intelligence" as key components of his
theory of intelligence. These concepts help explain
how intelligence changes and develops over a
person's lifespan.1. **Fluid Intelligence:**─Fluid intelligence refers to the ability to reason,
think, and solve novel problems in real-time,
without relying on previously acquired knowledge
or skills.─It involves the ability to think abstractly, reason
logically, and adapt to new situations.─Fluid intelligence tends to decline with age,
particularly in later adulthood, as it is more
dependent on biologically-based cognitive
processes that may degrade over time.2. **Crystallized Intelligence:**─Crystallized intelligence, on the other hand, refers
to the accumulation of knowledge, skills, and
information acquired through learning and
experience.─It involves the application of previously acquired
knowledge to solve problems or complete tasks.Cattel, fluid and crystallised intelligence