Neutral in my experience - I find sleep deprivation is far, far, far more damaging to my ability to think clearly. If I code while stoned, I find I take longer

Neutral in my experience - I find sleep deprivation is far, far, far more damaging to my ability to think clearly. If I code while stoned, I find I take longer, but come up with ideas I may not have otherwise considered - and I take way more notes and actually document my code, due to the whole memory thing - which is only while you're stoned, rather than permanent. I mean, if you inject most of the LD50 of THC into your blood stream every few hours from infancy to adulthood, you're going to have some significant neurological problems - just like the lab rats used in the study I think you're referencing.