A rat is conditioned to press a lever for food. One day a food pellet jams in the automatic feeder and the rat no longer receives food after pressing the lever. After a few minutes, the rat eventually stops pressing the lever. This is an example of:
a. negative reinforcement.
b. extinction.
c. classical conditioning.
d. avoidance learning.
Answer: B
Rationale: This refers to the weakening of a response when reinforcement is no longer available.
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Within each cell is a nucleus that contains 23 matching pairs of rod-shaped structures called chromosomes.
Answer the following statement true (T) or false (F)