ourselves, as well. >> how has this been affecting our brains? >> one of the ways is just by shifting the reward cycles that we are used to. so now rewards are very, very frequent and low value. but they happen rapidly and that changes essentially your cognitive style and how you like to be rewarded. >> the brain adam tells me interprets every text, alert or like as a reward. causing dope mean to surge in the pleasure center. over time, that can change how the mind works. training us to need more and more from our devices. it's a feedback loop that's hard to resist. and for some, that loop can spiral out of control and cross a line from mere distraction to addiction.