Psychostimulant injections
a. increase stereotyped behavior when microinjected into the nucleus accumbens.
b. increase locomotor behavior when microinjected into the striatum.
c. when they are microinjected into the nucleus accumbens, are always rewarding to animals, particularly if the stimulant is cocaine.
d. have their reinforcing effects effectively blocked by 6-OHDA lesions of the nucleus accumbens.
e. of amphetamine into the nucleus accumbens do not appear to be rewarding to animals, as they will not self-administer the drug.