The Relationship between Intelligence and Age among Superior Adults

Discussions on the relationship between birth order and intelligence are controversial. Birth order is considered to be ranked by age among brothers. Many researchers are studying this problem to determine if the first child's IQ score is higher than normal siblings. Some scientists concluded that birth order has a strong influence on intelligence; however, others opposed this, claiming that birth order does not affect intelligence. In this article, my research includes the influence of birth rank on intelligence.

Studies on the development of intelligence in adulthood and seniority have many controversies. The development of new empirical data and research design and methodology is one of the factors that affects the intellectual perspective of adulthood and seniority. Early cross-cutting psychological research on the intellectual ability of adults (Willoughby, 1927; Miles & Miles, 1932) found that elderly people generally did not do as well as young people. Wechsler standardized his Wechsler - Bellevue intelligence scale in 1944, and the selected samples represent the occupational distribution of the US census. He found that the "speech" score of this cross-sectional sample is relatively stable over the ages of 20 to 60 years, while the elderly "performance" score is lower. This result was repeated in the 1955 Wexler Adult Intelligence Scale (WAIS) standardization.

Schmithorst and colleagues analyzed the relationship between intelligence and white matter structure using DTI. The sample contains 47 children and adolescents (ages 5 to 18 years old). The white matter structure was investigated using fractional anisotropy (FA) and average diffusion coefficient (MD) index. These indicators relate to the intelligence score obtained from the Wechsler scale. Researchers found that there is a positive correlation between the white matter associated with white matter-related areas on both sides (forehead and occipital area). These correlations are believed to reflect a positive correlation between fiber tissue density and intelligence.