R. Douglas Fields Ph.D

Source: Dr Daniel Bell, Prof Frank Gaillard et al, Radiopaedia.org. License: CC BY NC ND 3.0 IQ is generally considered relatively stable throughout life. This supports the belief that intelligence is largely determined by genetics. From the time IQ tests were first devised in the 1920s to the present day, differences in IQ among people with different genetic backgrounds are evident. New research does not question these facts but instead shows that people have jumped to the wrong conclusions.

Socioeconomic status is the prime factor in IQ, brain structure, and function. Differences in IQ, brain structure, and function are contaminated by failing to consider socioeconomic status. Environment affects many other traits, cognitive abilities, brain anatomy and function. IQ is generally considered relatively stable throughout life. This supports the belief that intelligence is largely determined by genetics.