Title: Welcome to CK-12 Foundation | CK-12 Foundation
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Content: If this occurs, the animal has become sensitized to sounds. Scientists have demonstrated that sensitization occurs because of changes in nerve cells and nerve pathways (see The Nervous System and The Endocrine System concepts). These changes take place after nerves have been stimulated repeatedly. This sometimes occurs in a person who has had a painful injury. With repeated stimulation of the nerves, sensitization occurs, and the pain continues even after the injury is healed. Classical Conditioning
Classical conditioning is a type of learning in which an animal learns to associate one stimulus with another. In this type of learning, a stimulus that normally produces a particular behavior is linked with a second stimulus. The second stimulus is something neutral to which the animal does not normally respond. If the animal is repeatedly exposed to both stimuli together, it learns to associate the two stimuli. Because of this association, the animal will respond to the second stimulus alone in the same way that it responds to the normal stimulus.