Study refers to reserved, self-centered, role model, and average categories
                                
                                
                                    (Newser) -
                                    Northwestern University psychology professor William Revelle  spent years  trying to show there are no real personality types. His  latest research  published Monday in  Nature Human Behavior  points to the opposite conclusion. Using data from 1.5 million survey respondents, it identifies four clear personality types—average, reserved, self-centered, and role...