How Does "Valence" Help Your Brain Distinguish Between Good And Bad?

Have you ever had anyone tell you that they feel the "good kind of tired" while you are feeling the much-more-common bad kind of tired? How do you experience having a good appetite versus just being hungry? To put in scientific terms, how do we judge valence? » 5/12/14 8:20am 5/12/14 8:20am

Chimp and human brains are even more alike than we thought

When we're born, the part of our brain that controls our most complex cognitive functions, such as self-awareness and creativity, isn't fully formed yet. It then starts developing very quickly...and much the same happens with chimpanzees. » 8/11/11 5:30pm 8/11/11 5:30pm