Seven primary mental abilities and a general factor 4. Younger people have grown up in an environment more conducive to high IQ's. IQ reflects educational opportunity. Tests were not culture-fair. Progress Check 2 1.
More gifted children come from higher socioeconomic levels.
More gifted children are emotionally well adjusted. Gifted children are most successful in later life. Gifted children are above average in height, weight, and physical development. Progress Check 2 1. Environmental influences have some effect on intelligence.