Sex Differences in Intelligence: The Developmental Theory

In Sex Differences in Intelligence, Dr. Richard Lynn challenges the widely held belief that males and females possess equal intelligence. He presents findings from his extensive research, revealing that:

• Young girls tend to have a higher average intelligence than young boys.
• Among school-age students, boys and girls exhibit approximately the same level of intelligence.
• In adulthood, however, the average intelligence of men surpasses that of women by four IQ points.

Dr. Lynn supports his Developmental Theory with a comprehensive review of over one hundred studies, conducted both by himself and other reputable scientists.

Exploring the Reasons Behind the Differences

The book delves into the causes of the higher average intelligence observed in men during adulthood. Key points include:

• Brain Size:
  Men have a larger average brain size than women. Dr. Lynn refutes feminist claims that brain size is unrelated to intelligence.
• Evolutionary Factors:
  • Men may have evolved higher average intelligence as a means of competing with other men for territory, status, and ultimately, the ability to secure mates and pass on their genes.
  • Sexual Selection: Women have historically preferred males with higher intelligence, viewing them as better potential providers for themselves and their children.

This groundbreaking book promises to revolutionize the understanding of sex differences in intelligence.