http://www.news.com.au/lifestyle/re...s/news-story/56f0b192b22d6ebb4d3906a9f65b5211 What is the brain circuit responsible for this behavior.. for example.. a person used to be happy, then one day he won a lottery then realized he lost it then commit suicide. Another example. A person used to be happy.. then her found a man or woman lover who later dumped him/her then went into depression.. he/she could have been happier if she didn't meet the man or woman or another example. You have a normal job.. then found a big job with big salary.. then lost the opportunity and return to normal job.. but end up sad or angry... It seems related to this reward system in the brain? how does the neuro anatomy of it works? what exact organs are involved? And is there attempt to create medicine to fix it so one can become contended like living the life before one won and lost the lottery ticket? Is this behavior unique to the brain?