How are the UCR and CR related?

Answer 1

In "classical" or "respondent" conditioning (as observed by Pavlov), a "conditioned response" (CR) is learned when a "conditioned stimulus" (CS) is presented before and/or during the presence of an "unconditioned stimulus" (UCS). The CR is similar to the "unconditioned response" (UCR) in that the same physiological effectors are recruited to respond. For example, when Pavlov rang a bell (CS) before introducing meat powder (UCS) in a dog's mouth, the salivation (UCR) that normally begins the dog's digestion processes came under the control of the bell. This learned salivation in response to the bell (no longer involving digestion at all) is the conditioned response (CR). Both the UCR and the CR involve the salivary glands. Interestingly, the UCR of salivation produces saliva that is chemically distinct from that of the CR of salivation.

Answer 2

The Unconditioned Response (UCR) and Conditioned Response (CR) are both types of responses in classical conditioning. The UCR is an involuntary response to a stimulus, while the CR is a learned response that occurs as a result of association with a conditioned stimulus. Essentially, the CR is a modified version of the UCR that occurs in response to a different stimulus.