Why do people say that the prefrontal cortex, who is responsible for high order thinking improves with positive thinking and shrinks and gets damaged by negative thinking when in reality seems to be the opposite? If you're happy and positive your mind get clogged and you also become confident which is the opposite of high order thinking and reason. By that I'm not saying being negative is necessarily more reasonable but it correlates more often than negativity because even if it's forceful you look at things for what they are and don't just assume everything is going to be alright which might help you for survival.