WE ARE ALL familiar with the rough geography of the United States – the slash of the Rocky Mountains between two great coastlines, the bulge of Maine, the Florida peninsula, the Great Lakes, set in the heartland.

But what about the country’s psychogeography? You know, the great river of extroversion that flows roughly southeast from greater Chicago to southern Florida? Or the vast lakes of agreeableness and conscientiousness that pool together in the Sun Belt, especially around Atlanta? Or the jagged peaks of neuroticism in Boston and New York?

It’s time to learn.

Psychologists have shown that human personalities can be classified along five key dimensions: agreeableness, conscientiousness, extroversion, neuroticism, and openness to experience. And each of these dimensions has been found to affect key life outcomes from life expectancy and divorce to political ideology, job choices and performance, and innovation and creativity.

more from Boston Globe Ideas here.