Leigh enjoys cats. Her cats are fed canned cat food but over time they have started to get excited when she opens the can. The conditioned stimulus in this instance is the excitement over the canned cat food.
In contrast to an unconditioned stimulus, a conditioned stimulus causes the same response in an organism. Simply described, a conditioned stimulus is a stimulus that is connected with another stimulus, causing an organism to respond to it. Beginning as neutral stimuli, conditioned stimuli do not elicit a response until conditioning has taken place through repeated stimulation.
In other words, over time, the response is taught. The neutral stimulus cats turns into a conditioned stimulus when it is repeatedly exposed and is paired with the unconditioned response. In honor of the Russian scientist Ivan Pavlov, who discovered the phenomenon during his studies with conditioned stimulus dogs, the conditioned stimulus is also known as classical conditioning or Pavlovian conditioning. The cats unconditioned stimulus lies on the spectrum's opposite end from the conditioned stimulus.
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