These tests come in many forms: some are mostly visual, others include language and basic math skills, 3-dimensional spatial tasks, and logic questions, but what is common to all of them is that they attempt to measure the g-factor, or the common factor in a person's performance on all tasks: intelligence. Initial applications included screening impoverished populations to select gifted students among them, as well as screening recruits for the U.S. Brief history of intelligence measurementĪttempts to measure intelligence date back to at least the 19-th century, but it wasn't until the mid 20 century that well-developed tests were invented. It is not a very intuitive scale which is why many people want to see their IQ percentile or rarity, which is what our IQ percentile calculator above is ideal for. It is expressed on an IQ scale which is defined such that most people have an IQ between 80 and 120 (see the IQ scale section for details and on interpreting your IQ score). IQ stands for "Intelligence Quotient" and is a measure of human intelligence obtained through standardized tests. The IQ scale - how to interpret an IQ score.Brief history of intelligence measurement.
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