In classical conditioning, the Neutral Stimulus (NS) becomes a Conditioned Stimulus (CS) after it reliably signals the impending occurrence of the Unconditioned Stimulus (US).
The conditioned stimulus (CS) is a neutral stimulus (NS) that - after being repeatedly presented before the unconditioned stimulus - evokes a similar response as the unconditioned stimulus (US).
For example, a cat staring at a can of food (unconditioned stimulus) reacts differently to the sound of a can opener being struck on any surface (neutral stimulus). But if you condition a cat to believe that striking a can opener on any surface signals it will eat a can of food, the neutral stimulus becomes the conditioned stimulus.
Learn the difference between classical and operant conditioning here: https://brainly.com/question/17583598
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