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Look at the impact on brain development. what do you make of that age of 21 being the cut off? >> during development, lots of things happen to the brain. it's unfortunate that we don't have a definitive time at which we know the brain is finished developing and it's clear you can do whatever you'd like. while the brain is developing the frontal cortex is the last to come online. and to be fully developed. the most important for things like regulating impulsivity, we already know that lots of emerging adults have difficulties making good decisions or not being impulsive. if you add to that diff...

For single out in some way? >> some parents might be concerned about their child being labelled. >> and they should be. >> if you went in and they said, oh, you know, littlejohn any is having problems in school paying attention and that's because he's callous and unemotional. as opposed to going in and saying you're doing a great job. his diet's improved. we checked out this biomarker. it turns out that he's got a little bit too much dopamine in his right cortex and that's indicative of impulse control problems. i want you to go through this therapy for a couple of weeks, come back and see me....

With a genetic marker connected to violence be deemed dangerous for single out in some way? >> some parents might be concerned about their child being labelled. >> and they should be. >> if you went in and they said, oh, you know, littlejohn any is having problems in school paying attention and that's because he's callous and unemotional. as opposed to going in and saying you're doing a great job. his diet's improved. we checked out this biomarker. it turns out that he's got a little bit too much dopamine in his right cortex and that's indicative of impulse control problems. i want you to go t...

Thank god he doesn't know what he's singing. and he knows thattine mommy thinks it is. >> that is from a brain perspective and looking at the child's brain, it the back of t brain all instinctual and developing their pre-front at cortex where they're trying to make sense out of the world. when you see a graphic image like that it's all a back part of the brain and emotional. >> there were no breasts or no genitals shown. better that than showing violent images which can really really damage kids. >> we don't want either. >> we don't want either. >> thanks for the spirited conversations. meanwh...

Brain activity patterns in these animals we saw. and there's a surge of high-frequency brain waves in the frequency we call a gamma. so those frequency waves increase in power density. and not only that, different parts of the brain actually collaborate with each other in this synergistic way. very coherent manner. so the front of the brain is communicating with the back of the brain in a very meaningful manner. so those are really the key features we're looking for. >> so when that burst of brain activity happens, would that cause you to think about a bright light or beautiful thoughts, or wh...