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Intelligence encompasses a number of mental abilities such as reasoning, planning and problem-solving. The topic of intelligence is one of the biggest and most debated in psychology. Learn more about some of the many theories of intelligence, the history of intelligence testing and much more.

Theories of Intelligence
While there are numerous theories of intelligence, psychologists do not agree on a standard definition for the concept of 'intelligence.' Here are some of the major theories.

What Factors Determine Intelligence?
In addition to disagreements about the basic nature of intelligence, psychologists have spent a great amount of time and energy debating the various influences on individual intelligence. The debate focuses on one of the major questions in psychology: Which is more important-nature or nurture?

Intelligence and IQ Testing
Intelligence is a major topic within psychology, but it can also be one of the most controversial. Learn more about some of the major issues in intelligence and IQ testing.

Fluid Intelligence vs. Crystallized Intelligence
Psychologist Raymond Catell suggested that there are two different types of intelligence: fluid intelligence and crystallized intelligence. Learn more about the differences between fluid and crystallized intelligence.

What's Your EQ? - Emotional Intelligence Test
Often referred to an emotional intelligence quotient (EQ), this ability to perceive, control, and evaluate emotions has been suggested to impact life success and interpersonal functioning. What is your emotional intelligence quotient? You can learn more by taking the emotional intelligence test.

Emotional Intelligence
What exactly is emotional intelligence? Learn more about the history, importance, and measurements of emotional intelligence.

The Wechsler Adult Intelligence Scale
The Wechsler Adult Intelligence Scale (WAIS) is one of the most popularly used psychological tests in existence. Learn more about history and uses of this test.

What Is the Average IQ?
Ever wonder what the average IQ is? Learn more about the average IQ on most modern tests of intelligence.

Does Brain Training Really Increase IQ?
Can playing brain games really make you smarter? Two recent studies explore this question and offer some interesting results that might challenge what you believe about brain training.

Are People With High IQ More Successful?
People with high IQ's also tend to be more successful, right? Research suggests that IQ can help, but it isn't the only factor that determines success. Learn more...

What Is Considered a Low IQ?
IQ scores are a hot topic in psychology, and a controversial one. What IQ score is considered low and what exactly does it mean to have a low IQ?

IQ or EQ: Which One Is More Important?
Some experts suggest that your EQ might be more important than your IQ. Could emotional intelligence really matter more than traditional intelligence? Learn more...

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