Cattell's culture fair test of intelligence
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Raymond B. Cattell was a scientist who wanted to create an intelligence test that measured an individual’s IQ in a manner that was devoid of all sociocultural and environmental influences. He believed that someone’s IQ was a cumulative measure of their fluid intelligence and crystallized intelligence. When measuring these two factors, it is possible to retest someone and measure how much of their fluid intelligence was lost over a certain number of years, or how well set their crystallized intelligence is after years of experience and study. To Cattell, intelligence is founded partially on biological and partially on environmental factors, and he also believed that nonverbal assessment was the best way of discerning someone’s true IQ. With that, since the test was designed to be as free of sociocultural and environmental influences, it serves as a great utility of analysis for most age ranges.