Routtenberg and Lindy (1965) allowed rats access to two levers for one hour per day to either obtain ICSS or food. They found that
A. rats pressed both levers equally.
B. rats pressed the ICSS lever slightly more than the food lever.
C. rats pressed the food lever slightly more than the ICSS lever.
D. rats pressed the ICSS almost exclusively and many starved to death.
Answer: D
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