Encoding information is registered (basic sensory analysis) Consolidation strengthening of sensory representation, making a more permanent change to the n. s. Storage information is transferred to some kind of storage (long vs. short term); persistent changes to n. s. Retrieval information accessed from the store and used. Perceptual learning changes in the sensory systems of the brain. Stimulus-response learning establishment of connections between sensory systems and motor systems. But under sensory guidance (e. g. bicycle, video game controllers, tennis etc. ,) Learning to recognize stimuli perceived before: function: categorize and recognize objects and situations. Changes in sensory association areas replay of perception. Unconditioned stimulus (us) stimulus that produces a defensive or appetitive reflexive response. Unconditioned response (ur) reflexive response to the us. Conditioned stimulus (cs) stimulus, which when paired with the us during training, comes to elicit the response. Conditioned response (cr) response to the presentation of the cs.