The aim of the study was to investigate the relationship between the Flynn effect and the effects of age differences between siblings on the intelligence difference between them. In Norway, the secular trends in intelligence-test score means vary both in magnitude and direction. We identified three periods: one period where the mean intelligence…

This issue of a research journal on gifted education examines a number of research projects that delve into questions of how family life affects intelligence, especially among gifted children. Specific articles include: (1) "Are We Raising Smarter Children Today?" (Wendy M. Williams), which discusses the effects of school-related factors…

According to confluence theory, a child is helped or hindered in intellectual development according to the average absolute intelligence (mental age) in the family when the child is born. An analysis of test scores, family information, and socioeconomic data of 36,000 college applicants in Colombia failed to support this theory. (Author/CP)