This optical illusion personality test, featuring a woman, two faces, and a candle, reveals aspects of your true nature based ...

This layered optical illusion reveals your mental wiring. Whether you spot the cat, rat, food, or woman first, it reflects ...

In ancient Greece, the physician Hippocrates is said to have theorized that the ratio of four bodily fluids—blood, yellow bile, black bile, and phlegm—dictated a person’s distinct temperament. The ...

Shannon Sauer-Zavala receives funding from that National Institute of Mental Health to support her research. Have you ever taken a personality test? If you’re like me, you’ve consulted BuzzFeed and ...