perceptual distortion
lack of correspondence between the way a stimulus is commonly perceived and the way an individual perceives it under given conditions
phantom pain
medical condition
hallucination
perception in the presence of no external stimuli found, but characteristic of true perception
hallucinosis
psychopathological syndrome characterized by hallucinations
illusion
distortion of the senses or perception of reality, which may reveal how the human brain normally organizes and interprets sensory stimulation