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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 body kick starts production, you feel lousy, so many people smo...

Done too much? >> simple tasks become very frustrating, like mixing paint, and then just sort of get into this state of, you know -- >> and why that happens is exactly what columbia university neuroscientist carl hart is investigating. >> exhale. >> research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> the affects will be disruption in memory, disruptions in inhibitory control. they will become slower at cognitive functioning, a wide range of things. these affects are temporary, but they're pretty pronounced, and they are clear. >> and it's slowly becoming...

Frustrating, like mixing paint, and then just sort of get into this state of, you know -- >> and why that happens is exactly what columbia university neuroscientist carl hart is investigating. >> exhale. >> research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> the affects will be disruption in memory, disruptions in inhibitory control. they will become slower. at cognitive functioning, a wide range of things. these affects are temporary, but they're pretty pronounced, and they are clear. >> and it's slowly becoming clear to scientists what part of the brai...

Frustrating, like mixing paint, and then just sort of get into this state of, you know -- >> and why that happens is exactly what columbia university neuroscientist carl hart is investigating. >> exhale. >> research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> the affects will be disruption in memory, disruptions in inhibitory control. they will become slower at cognitive functioning, a wide range of things. these affects are temporary, but they're pretty pronounced, and they are clear. >> and it's slowly becoming clear to scientists what part of the brain...

Disassociative amnesia? is that something you can fake? >> ptsd certainly has built into the criteria the idea of memory loss. this whole idea is that something was so traumatic that the brain kind of kicks in, takes over and blocks it out. the two areas he was referring to were the hippocampus which is responsible for memory and the prefrontal cortex. that being said, i think this is going to be a very difficult case to prove for two reasons. one is because she knew enough earlier on to admit that she killed him in addition to telling different stories. somebody who has ptsd who doesn't remem...