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An overall capacity to think rationally, act purposefully, and deal effectively with the environment.

Mental Age

The averge mental ability people display at a given age.

Intelligence Quotient (IQ)

An index of intelligence defined as a person's mental age divided by his or her chronological age and multiplied by 100.


The process of thinking or mentally processing information (images, concepts, words, rules, and symbols).


An idea representing a catagory of related objects or event.


An ideal model used as a prime example of a particular concept.


The study of meanings in words and language.


In problem solving, a deeper comprehension of the nature of the problem.


A sudden mental reorganization of a problem that makes the solution obvious.


Quick, impulsive thought that does not make use of formal logic or clear reasoning.

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