An unconditioned stimulus (UCS) is a stimulus in the environment that automatically elicits a response, leading to an unconditioned response. An example of an unconditioned stimulus is dog food.
An unconditioned response (UCR) is an automatic response to an unconditioned stimulus. An example of this, from Pavlov's experiment, is a dog drooling as a response to being presented dog food.
A neutral stimulus is a third element introduced to a classical conditioning environment. This is classified as an environmental event that does not automatically elicit a conditioned response. In Pavlov's experiment, the neutral stimulus was the bell.
A conditioned stimulus is described as a neutral stimulus that has been repeatedly paired with the unconditioned stimulus and now elicits the response. In the case of Pavlov's experiment, the conditioned stimulus is the bell, which the dog now associates with food.
A conditioned response is the response which occurs when presented a conditioned stimulus. For example, in Pavlov's experiment, the dog's salivation to the sound of the bell is not an automatic or unconditioned response, but rather a learned response, called the conditioned response.
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