Such images have long fascinated scientists and philosophers because they seem to represent different ways of seeing. So ...

A pair of psychologists in the U.K. report that there is no scientific basis for the idea that personality ... to test the theory. Over the past several years, ambiguous images on the internet ...

In contrast to modern trait theories, those rooted in psychoanalytic ideas have tended to emphasize the potential role of early development in shaping personality. Sigmund Freud, the father of ...