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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 effects are temporary, but they are pretty pronounced and they are clear. >> and it's slowly becoming clear to scientists what part of the brain...

A delicate balance for him. >> it would make me very apprehensive, maybe a little paranoid. just too analytical. >> can you get paranoid, have disorganized thinking, disoriented. it can be uncomfortable. it can lead to pan uk attacks or 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...

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 sort of get into this state of duh, 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 effects will be disruption in memory, diggs ruptions in inhibitory control. they will become slower at cognitive functioning, a wide range of things. these effects are temporary, but they're pre...

>> stop worrying so much about this and that and just sort of looking and being as present as possible. >> amir does caution that it's a delicate balance for him. >> it would make me apprehensive, maybe a little paranoid. just too analytical. >> can you get paranoid and have disorganized thinking. you get disoriented. it can be uncomfortable. it can lead to panic attacks or 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 sort of get into this state of, you know -- >> and why that happens is exact...

>> 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 clear to scien...