Freddie used to feed her cat canned cat food. now every time freddie uses the can opener, her cat gets very excited and starts meowing. in this example, the us is

the CS is the sound of the can opener. Conditioned Stimulus or CS is a stimulus that was previously neutral but now has the ability to produce a conditioned response. That is, in this case, the cat learned to get excited when he heard the box without having to see the food.

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