In the psychometric view, adolescence is a period of cognitive stability. Intelligence quotient (IQ) scores show little change during adolescence. Although IQ scores often fluctuate during early childhood, scores generally stabilize about age eight. It is common to find temporary periods of instability in IQ scores after age eight, such as at the onset of puberty or during other stressful times, but dramatic and long-term score changes are rare. According to this perspective, adolescence does not bring significant changes in cognitive skills.
Theory and research on cognitive skills began with the development of modern intelligence tests, such as Alfred Binet's 1916 test; however, the intelligence-testing, or psychometric, approach has contributed little to an understanding of adolescent cognitive skills. Intelligence tests are best suited to the study of individual differences, or how people compare to others of their age. It is difficult to use intelligence testing to compare and contrast cognitive skills at different ages.
Intelligence tests also are used to study the stability of intellectual level and the likelihood it will change in later years. Research indicates, however, that intelligence test scores in adolescence generally are similar to scores during childhood, although scores may fluctuate during childhood as a function of changes in factors such as diet, socioeconomic status, and education. Again, the psychometric approach seems poorly suited to the study of adolescent cognitive skills.
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