When researchers were investigating conditioned tolerance, they injected rats with heroin in both familiar and novel environments. What happened?

A. The drug produced less of an effect in the novel environment.
B. The drug produced more of an effect in the novel environment and killed more rats.
C. Nothing, opiates like heroin are immune from the conditioned tolerance effect.
D. Only selected effects were observed in the novel environment.


Answer: B

Psychology

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