A pigeon receives food for pecking a key, but only rarely and on unpredictable occasions. This best illustrates

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A pigeon receiving food for pecking a key only rarely and on unpredictable occasions is an example of partial reinforcement. This is because the reinforcement (food) is not given after every response (pecking the key), rather it is given after some responses but not others, creating an unpredictable pattern of reinforcement.

A Pigeon Receives Food for Pecking a Key, but Only