peter showed me a passage from john cheever talking about drinking and he looked at his notes and he knew that drinking was not good for him and how many times had he said "i've got to stop, i've got to stop." and yet he said the next day at lunchtime i find myself taking a baht of of whiskey out. >> it's a powerful habit. >> that's right. it's some of the same neurocircuitry we've been talking about but it becomes hijacked and mediate it is formation of habits that are very maladaptive. so this is now meant to represent in part some of the key structures in their connections in relation to habit formation. so as wolfram has described earlier, dopamine neurons are providing information about reward and in particular about when a reward or stimulus is better than expected. and when you think about a good habit that is adaptive, we all want to form habits when we form habits because they help us survive and we can perform behaviors automatically without thinking about it and it's more efficient. so that can be driven in part by the output for a dopamine neuron because something happens