Mood control is being developed by US Government - this is not going to end well...

Image source: www.troutinmilk.com
Was "Metal Gear Solid 4: Guns of the Patriots" predicting the future?
DARPA is now doing research with neuroscientists and cybernetic engineers to manipulate emotions in order to treat PTSD in US Soldiers. 
How well can you predict your next mood swing? How well can anyone? It’s an existential dilemma for many of us but for the military,