Which type of intelligence involves speeded reasoning and abstract thinking and tends to decline during late adulthood?

• A. Crystallized intelligence
• B. General intelligence
• C. Emotional intelligence
• D. Fluid intelligence

Answer: (D)

Fluid intelligence is the ability to solve new problems, think abstractly, and reason quickly without relying on what you’ve already learned. These fast, flexible processing skills are especially vulnerable to aging, so performance on tasks that measure this kind of thinking tends to decline in late adulthood. In contrast, crystallized intelligence comprises accumulated knowledge and skills, like vocabulary and general information, which generally stay stable or can even improve with age. General intelligence refers to a broader overall ability, not specifically tied to aging patterns described here, and emotional intelligence involves managing emotions rather than rapid, abstract problem solving.