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Will be the thing that we hold them for. harmeet dhillon, you are the voice on the right side. thank you for joining us as always. >> thank you, tucker played >> tucker: meanwhile, we have been saying it for years, now they are the hard sign evidence that big tech is harming children. the 60 minutes highlighted research that says that children who use tablets, smartphones, and other screens more than seven hours a day, and that is a lot of kids, believe it or not are developing different brain structures. their brains are being damaged by this. a psychotherapist who has written on the subject,...

Changed and not in a good way, affecting emotion, motivation and leading to addiction. >> right. so we've seen studies on long-term drug use. you always hear the argument, well, it's only once in a while. >> yeah. >> let's take look what this casual pot use does. significant abnormalities in two brain structures. they looked at density, shape by casual use. the work memory was effected. that's responsible for your decision making and just sort of everyday common sense. the brain regions are associated with motivation so that idea that you can get emotion vagal syndrome so you can not get motiv...

Twice a week still show significant abnormalities in brain structures dealing with motivation and emotion. a physician and professor of public health at johns hopkins university. one of the things that comes up when we talk about marijuana is or is not a lot of research of long-term effects, maybe just physical effects of smoking marijuana. what do you think this study tells us? >> we have been told there is absolutely no downside to your health, and we have been told it is dangerous. it is something of a mild impact on health, probably immediate, humbly not long-lasting and the study publishe...

Happen to have with me a model of the brain. if you look at brain structures, it's possible to see postmortem structures, temporal areas next to the temple, they show deteriorating yeas. it's possible to determine that people had it postmortem. technology has allowed us to see that earlier and perhaps adopt therapies, implement therapies to help people at greater risk of dementia. >> i'll never forget this. >> hard to put it back in. >> but i will never forget hearing you say don't invest in the hand-held games, memory games. that actually will not improve and protect your memory. >> that's ri...

>> well, you did one interesting experiment. you asked volunteers to imagine kind of mundane events like getting a haircut, and you got some surprising answers. explain that. >> yeah. well, that's actually what started my interest in the optimism bias. i was actually looking to see whether the brain structures that are involved in remembering our past are also involved in imagining the future. but then what happened when i asked participants to imagine events that might happen to them in the future, even everyday events, as you mentioned, like getting your haircut or going on a flight, they te...