<prompt> Neurotransmitter implicated in pleasure-seeking behaviorDopamineSerotoninNor epinephrineGABA  <response>: Focus on Dopamine Scientists probed fuher to see if they could link the brains reward systems to a paicular set of chemical mechanisms. They soon found that blocking the neurotransmitter dopamine seems to reduce an animals pleasure-seeking drives. For example, depleting dopamine in the brain causes animals to become oblivious to food and other normally pleasurable rewards. Ref: guyton and hall textbook of medical physiology 12 edition 