1) A learned response elicited by the presentation of a conditioned stimulus.

2) Responses in which the class of eliciting stimuli has acquired this function because of a history of being paired with unconditioned stimuli.

3) A conditioned response is the change in the organism's behaviour elicited by a conditioned stimulus. In a reflex, the buzzer (conditioned stimulus), which precedes food in the dog's mouth (unconditioned stimulus), comes to elicit salivation (conditioned response) after a sufficient number of pairings.

4) An arbitrary stimulus, such as a tone, is associated with an unconditioned stimulus that elicits reflexive behaviour (e.g., food elicits salivation). After several pairings, the stimulus is presented alone. If the stimulus now elicits a response (tone now evokes salivation), the response to the tone is called a conditioned response (CR).