THE BRAIN FROM TOP TO BOTTOM . the action of a natural neurotransmitter called . In smokers, repeated nicotine stimulation thus increases . amount of dopamine released in the nucleus accumbens. .
Natural Brain Chemical Reduces Cocaine Effects . can be regarded as surrogates of natural rewards. . Addictive drugs - such as stimulants (cocaine and amphetamines . the DA input to the nucleus accumbens (in which .
