Before revision: "Neuron : Experimental Genetic Approaches to Addiction", A. Laakso, 2002, webpage: LinkingHub.elsevier.com-728 : states "exposure to psychostimulants such as cocaine leads to sensitized response; long-term treatment with opiates (such as morphine) also has inverse consequences".
After revision: "Neuron : Experimental Genetic Approaches to Addiction", A. Laakso, 2002, webpage: : states "exposure to psychostimulants such as cocaine leads to sensitized response; long-term treatment with opiates (such as morphine) also has inverse consequences".