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A Doctor Gives a Patient in Chronic Pain a Morphine

Question 121

Multiple Choice

A doctor gives a patient in chronic pain a morphine pump to operate. The doctor tells the patient to press the button whenever she is in pain. The button press will result in a morphine injection, but only if it has been at least 1 hour since the last injection. The morphine pump is operating according to which schedule of reinforcement?


A) fixed ratio
B) variable ratio
C) variable interval
D) fixed interval

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