Author Ethan Watters thinks that America is "homogenizing the way the world goes mad." In Crazy Like Us: The Globalization of the American Psyche, he describes how American definitions and treatments of mental illness have spread to other cultures around the world.

"[McDonald's] golden arches do not represent our most troubling impact on other cultures," Watters writes. "Rather, it is how we are flattening the landscape of the human psyche itself. We are engaged in the grand project of Americanizing the world's understanding of the human mind."

Watters talks with NPR's Rebecca Roberts about the cultural diversity of mental illness — and how that diversity is quickly disappearing.

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