The first type of general intelligence is fluid intelligence (gf). It is not dependent on formal education and is more focused on solving abstract problems. The second type is crystallized intelligence (gc). It is more about the experience gained, general knowledge and vocabulary.
According to scientists, gc peaks around age 20 and then declines, while gc remains constant or improves with age. It is also known that general intelligence is hereditary.
General intelligence (g) can be assessed using intelligence quotient (IQ) tests. There are many types of IQ tests that focus on different cognitive abilities. But they all believe that if you are good at one type of mental task, you will probably be good at others.
Yes, IQ measures one aspect of our brain. But there are other types of intelligence: emotional intelligence, rational thinking. It enables the person to make correct judgments and decisions. At the same time, many people with high IQ are successful, but not all of them can act smart, rational and make the right choices in life.
Source: Ferra
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