And at what age does the human brain stop developing?
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I meant to say the hippocampus (not the nucleus accumbens) degenerates under stress and grows when taking an SSRI antidepressant, like Prozac. THC, the ingredient in marijuana, blocks the recoptors on the hippocampus. So you can't remember things.
What cool information.
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Alzheimers is an organic disease though ... not caused by lack of mental exercise.