Comment by hliyan

I have a personal theory (I'm sure it's not a novel one and it probably has a name) that human brains are naturally predisposed to negative thought than positive thought because our brains are essentially evolved prediction engines. And because it is often easier and faster to lose something than gain it (e.g. it is usually less urgent to act on the signs of deer you might want to hunt and eat, than the sign of a tiger who might want to hunt and eat you), our prediction engines have a bias toward negative prediction. Conscious awareness of this fact (or rather, theory) has helped me curb negative thoughts at least to some extent.