Which of the following statements is false, with regard to the self-administration of cocaine by laboratory animals?
a. When daily access to cocaine is limited, laboratory animals self-administer the drug in a steady and controlled manner.
b. When daily access to cocaine is limited, rats self-administer all available drug infusions.
c. When the opportunity to self-administer cocaine is restricted to certain times throughout the day, rats infuse most of the available cocaine during the dark phase of the daily cycle.
d. When access to cocaine is freely available, laboratory animals will often self-administer the drug to the point of lethal overdose.
e. When access to cocaine is freely available, monkeys will self-administer the drug at levels high enough to cause convulsions.
Answer: B
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