In classical conditioning, which element functions as a signal?

Name: In classical conditioning, which element functions as a signal?
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The conditioned stimulus (CS) functions as a signal in classical conditioning. This is because it is what initially does not elicit the response of interest (conditioned response, CR) but through association with the unconditioned stimulus (UCS), it comes to signify the arrival of the UCS and therefore elicits the CR.

In Classical Conditioning, Which Element Functions as a Signal