Can the brain be trained into a state of persistent happiness? Happiness is a state of mind. Can we retain this state even in the case of sadness, depression, or a dire situation through training? What methods could one use in order to train the brain to retain the happy state?
I'm not sure about the trained part, but there have been cases where people have spontaneously shifted into a very enjoyable state of mind for a very long time, for example: Eckhart Tolle, who supposedly spent 2 years in utter bliss.