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Although cerebellum abnormalities had long been suspected, it never has been proven until now, explained lead researcher and Columbia neurologist Sheng-Han Kuo in an email to Discover.

Dr. Mark Olfson, a professor at Columbia University who studies the impact of socioeconomic factors on suicide rates, said he did not find the results of Mr. Kaufman’s study persuasive.

The waning fear about the spread of HIV and AIDS among heterosexual youths has contributed to the decline in instruction, says John Santelli, a professor at the Mailman School of Public Health.

"The bottom line is the size of the American family has changed a lot over time," said Dr. John Santelli, a professor of population and family health at the Mailman School of Public Health.