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
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