Another factor that could cause the onset of claustrophobia is "information received." As Aureau Walding states in "Causes of Claustrophobia", many people, especially children, learn who and what to fear by watching parents or peers. This method does not only apply to observing a teacher, but also observing victims. Vicarious classical conditioning also includes when a person sees another person exposed directly to an especially unpleasant situation. This would be analogous to observing someone getting stuck in a tight space, suffocated, or any of the other examples that were listed above.