The brain detects negative information faster than it does positive. We are drawn to bad news. When something is flagged as a negative experience, the hippocampus (responsible for consolidating memory) makes sure it’s stored in an easy–to-reach place for future reference. If you whistled a happy tune and just thought lovely thoughts you’d probably be hit by a truck pretty quickly, and find yourself as road kill. This negative bias primes you for avoidance and fear but when you direct it at yourself, it can bring you to your knees with depression.
