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And pleasures the same way adults can, but the problem with that is that their prefrontal cortex, which helps people think ahead, control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there's something else that addiction experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana called cannabinoids, remember them? they cause your brain to stop producing its own natural cannabinoids. when you stop smoking, you have no feel good cannabinoids of your own. until your bod...

They can experience reward and pleasure the same way adults can. but the problem with that is that their prefrontal cortex which helps people think ahead, control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there is something else experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana, called cannabinoids, force your brain to stop producing their own natural cannabinoids. when you stop smoking be with you don't have them on your own. until your body kick starts ...

Anxiety attacks in people. >> how do you know when you've done too much? >> simple tasks become very frustrating. like mixing paint. and then just get into a state of ahhhhh -- you know. >> and why that happens is exactly what columbia university neuro scientist carl harp is investigating. >> exhale. >> research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> effects will be disruption in memory. disruptions in inhibitory con control. they become slower at cognitive functioning. a wide array of things. they are temporary, but pronounced and clear. >> it is sl...

Question because although i happen to believe that we overdiagnose childhood psychiatric disorders, adhd being the leading overdiagnosed disorder among them, there is a science behind it. for example, when we do brain scans for those who have been diagnosed appropiately with adhd, and in the frontal lobe, which is the largest area of the brain, the prefrontal cortex, responsible for things like language, decision-making as it relates to this conversation, attention, we see different neurochemical activity. so we can prove scientifically the adhd brain so to speak is the different from the non-...

Expert in the field and is now an adviser to the avielle foundation. >> we have 41 normal controls, motors in the group. this is illustrating the key finding. good frontal lobe functioning in the normal individual. but if you look at the motor here, there's a distinct lack of activation in that prefrontal cortex. >> the the research jennifer and jeremy want to fund will ask what might cause that low functioning and how a person with it could be treated early before becoming an adult. on top of the scientific work, aviell's parents want to reduce the stigma that keeps people from getting the he...