Principles of brain plasticity hold that exposure to technology may impact brain and behavior. To assess the impact of technology use, we compared populations with different media use in two different studies. A first study investigated the relative impact of media multi-tasking and video game play on cognition. Sixty-eight participants were classified as action-video/nonaction- video game players and as heavy/intermediary/low media multitaskers. While high media-multitaskers tended to underperform others on most cognitive control tasks, they were not at a specific disadvantage in the presence of distraction, failing to replicate previous reports. Importantly, media-multitasking and action-gaming status interacted in a complex fashion such that action gaming only benefitted cognitive control in intermediate multitaskers. In a second study we measured participant's abilities to update their belief as to relevant stimulus dimensions in a changing world. Seventeen participants were tested in a perceptual classification task...