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>> 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 effects 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're pretty pronounced, and they are clear. >> and it's slowly becoming clear to scien...

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 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 af...

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 slowly becoming clear to scientists what part of the brain is most effected. the prefrontal cortex. >> it is very important for plannin...

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...

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 neuroscientist karl hart 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 control. they become slower at cognitive functioning. a wide array of things. they are temporary, but pronounced and clear. >> it is slowly becoming clear to scientists what part of the brain is mos...