. >> and joining me now is film maker and physician delaney ruston. what made you decide to do this documentary? >> i was really struggling as a mom. i had a teenager girl who wanted more social media and avoid one more video game. and i wanted to know as a physician the impact of all of this screen time but really as a mom i wanted to know what to do. so that's why i made the film. >> so what is the impact? what is the scientific research show? >> well, i think there is evidence about this can effect empathy, development of empathy depends on reading social cues. and the science shows that when they take away devices, kids perform better on studies that look at their ability to look at the social cues. that makes me concerned. >> what about effects on learning and memory? has there been research done on that, as well? >> we have data that has just come out about mice. when they take young mice and they put them in a room with flashing lights and sounds to mimic the screen time of kids what is amazing is that the part of the brain that is responsible