A pigeon is consistently reinforced with food for pecking a key after seeing an image of a human face,but not reinforced for pecking after seeing other images. By signaling that a pecking response will be reinforced,the image of a human face is a(n)

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The image of a human face is a discriminative stimulus because it signals to the pigeon that reinforcement will be available for pecking the key, but only when the face image is present. Other images do not have the same signaling value for the pigeon.

A Pigeon Is Consistently Reinforced with Food for Pecking a Key