Question: A person using methamphetamine reports that activities they once enjoyed no longer feel rewarding and they now need increasing amounts of the drug to feel "normal." Which explanation, grounded in the neuroscience of addiction, best accounts for both symptoms together? Need Assignment Help? Question options: This reflects the therapeutic encounter effect described in the placebo reading This pattern indicates the drug is correctly classified as Schedule V This is an addiction response and is unrelated to brain chemistry Tolerance has reduce sensitivity to rewards and now the user must increase dosage