An Alternative Theory of IQ and Intelligence

Genes, Early Childhood Experiences, and Psychological Maturity

Have you ever met a man or woman over 20 years of age, but when you briefly spoke to them, you felt as though their manner of speech and choice of topic was chilldike? Such people have an IQ of around 70. They have the mental ability of a normal 10-year-old. And about 1-in-50 grown-ups you meet seem to be stuck at this level.

Indeed, recent studies all a…