A researcher reports that a drug directly stimulates a reward center in the brain rather than through indirect stimulation of a reward center. The drug the researcher is studying could be any of the following drugs EXCEPT:

Question

Quizplus · Accepted Answer

Marijuana is not known to directly stimulate the reward center in the brain, but rather indirectly through its effect on the release and uptake of neurotransmitters like dopamine. The other three substances listed - powdered cocaine, methamphetamine, and caffeine - are all known to directly stimulate the reward center in the brain.

A Researcher Reports That a Drug Directly Stimulates a Reward