How to Understand General Intelligence?

General intelligence, also known as the G factor, indicates the presence of a broad mental capacity that affects performance on measures of cognitive ability. Charles Spearman first described the existence of general intelligence in 1904. According to Spearman, this g factor was responsible for overall performance in mental aptitude tests.
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Heritability of IQ (Intelligence level)

Studies on the heritability of IQ express the ratio of IQ variance between individuals in a study population related to the genetic variable in the population, from the similarity of IQ in closely related persons. As environmental factors can correlate with genetic factors, it provides a maximum estimate of genetic

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