In an experiment on classical conditioning, a tone is followed by a puff of air to the eyes. After several repetitions, subjects blink their eyes when they hear the tone. In this experiment blinking is

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In classical conditioning, the unconditioned stimulus (UCS) naturally elicits an unconditioned response (UCR). In this experiment, the puff of air is the UCS, which naturally elicits blinking in response (UCR). However, after pairing the tone with the puff of air, the tone becomes the conditioned stimulus (CS) and elicits blinking in response, which is now the conditioned response (CR). Therefore, blinking is both the conditioned response (CR) and the unconditioned response (UCR) in this experiment.

In an Experiment on Classical Conditioning, a Tone Is Followed