The first part of a classical conditioning experiment is typically a Baseline Phase, which is used to show that the stimulus tha
t will be used as the conditioned stimulus is initially a/an stimulus that does not produce a/an response and that the stimulus that will be used as the unconditioned stimulus does produce a/an response. The second part is a Conditioning Phase, in which the are paired for several trials. The final part is a Test Phase, in which the experimenter determines whether the stimulus now produces a/an response.