Psychoactive Agents. Stimulants Psychodelics. Psychoactive stimulants. Stimulants: activate the central nervous system to produce arousal, increased alertness, elevated mood Typically affect dopamine, norepinephrine and serotonin Several drugs in this category Cocaine
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These brain sections have been stained with a chemical that makes neurons containing serotonin turn white. Photos in the top row are from a normal monkey; those below are from a monkey given MDMA a year earlier.
Virtually all the abused drugs increase dopamine levels in the nucleus accumbens