The field of psychology is vast, and there are many ways to carve it up. For example, one possible difference is between animal and human psychology. Another division is between science and practice.

This post has not been edited by the GamesBeat staff. Opinions by GamesBeat community writers do not necessarily reflect those of the staff. We’re all just a bit self-centered. It’s difficult to ...

1 Centre for Exercise and Sport Science, Deakin University, School of Exercise and Nutrition Sciences, Burwood, Victoria, Australia 2 Centre for Physical Activity and Nutrition Research, Deakin ...

How old do you feel? Experts explain how subjective age works, and why it matters. (Getty Images) Your heart tells you you're 27, but your birth certificate says 42. For many of us, there’s a big ...