Intelligence researchers in the early twentieth century believed that performance on any cognitive task depended on a major general factor, which Spearman labelled

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Intelligence researchers in the early twentieth century believed that performance on any cognitive task depended on a major general factor, which Spearman labelled as "g" or general intelligence. Choice B (IQ) refers to a measure of intelligence, not the general factor. Choices C and D refer to two types of intelligence proposed by Cattell, which are not the same as Spearman's "g."

Intelligence Researchers in the Early Twentieth Century Believed That Performance