APA Dictionary of Psychology

the hypothesis that excessive intrauterine exposure to androgens inhibits development of the thymus gland and left cerebral hemisphere, explaining why autoimmune disorders tend to be associated with learning disabilities (including dyslexia) and are more frequent in males than in females. [proposed in 1984 by U.S. neuroscientists Norman Geschwind (1926–1984) and Albert Galaburda (1948–  )]