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Classical Conditioning is a process of learning a response to a new stimulus through associative learning.

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It starts with an unconditioned stimulus (US) that elicits an unconditioned response (UR).

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We then introduce a neutral stimulus that does not cause a response.

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This stimulus, called the conditioned stimulus (CS), will be presented with or just before the US.

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After repeated pairing the CS will come to elicit a response of its own, called the conditioned response (CR).

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This process is called acquisition.

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If, after acquisition, the CS is repeatedly presented without the US, the participant will stop responding to the CS.

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This process is called extinction.

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After acquisition, there is a tendency for the participant to respond to stimuli that are similar but not identical to the CS.

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This process is called generalization.

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A participant can be trained to not respond to these stimuli and only respond to the CS.

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This process is called discrimination.