From the article: "When a stimulus from the old days returns, the dormant pattern can reassert itself...putting an individual in a neural state akin to being on autopilot."
Although this is an older article, I found it's findings fascinating in relation to AD/HD individuals that find themselves gravitating towards highly stimulating and addictive behavior. The AD/HD mind often instantaneously switches to stimulating activity at the onset of boredom. Unfortunately, sometimes that activity is harmful and addictive. Many people with AD/HD often lament that they find themselves pursuing addictive behavior almost as if they are on autopilot - as if their mind acts on its own accord before they have a chance to say anything to the contrary. The lack of impulse control coupled with the mind's tendency to fire up pathways to old habits when stimulated is a terrible combo for the AD/HD mind to overcome. Of course, not all habits are hazardous. I, myself, am addicted to information, and find myself on autopilot sometimes foraging the net for new info. Interesting article.