The Effect Of Larger Brain Size Predicts Greater Intelligence

937 WordsNov 16, 20144 Pages
Introduction Many studies show that larger brain size predicts greater intelligence. The studies show that on average men have approximately 4IQ points higher than women due to larger head circumference (HC). The greater IQ is generally formed after the age of 16 since women’s brains stop forming at this age but men’s continue to develop and grow. The longer growth period leads to more head circumference and brain mass which has been found be significantly correlated with higher intelligence. Even in the elderly, head circumference has been found to be positively and significantly correlated with intelligence (Schofield, Logroscino, Andrews, Albert, & Stern, 1997; Tisserand, Bosma, Van Boxtel, & Jolles, 2001). The larger HC is also believed to house more neurons which help in the speed of the information processing due to more synaptic connections (Pakkenberg & Gundersen, 1997). In general, general intelligence (G) is the best predictor of intelligence. In a Wall Street Journal article in 1994, 52 leading psychologists defined intelligence as “a very general mental capacity which, among other things, involves the ability to reason, plan, solve problems, think abstractly, comprehend complex ideas, learn quickly and learn from experience” (Gottfredson, 1997, p. 13); others have defined intelligence as the “sum total of all cognitive abilities” (Stankov & Roberts, 1997, p. 76). In all cases, males have tested higher on g than females leading researchers to believe
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