The fact that animals with no history of opioid withdrawal will press a lever to self-administer low doses of intravenous morphine or heroin demonstrates the importance of ____________ in developing opioid dependence.
A)withdrawal symptoms
B)positive reinforcement
C)peer pressure
D)tolerance

Question

Quizplus · Accepted Answer

The fact that animals with no history of opioid withdrawal will still self-administer opioids suggests that positive reinforcement (feeling pleasurable effects) is a critical factor for the development of opioid dependence.

The Fact That Animals with No History of Opioid Withdrawal