Hyposchemazia is characterised by the reduced awareness of a patient's body image and Aschemazia by the absence of it. These disorders can have many varied causes such as physical injuries, mental disorders, or mental or physical states. These include transection of the spinal cord, parietal lobe lesions (e.g. right middle cerebral artery thrombosis), anxiety, depersonalization, epileptic auras, migraines, sensory deprivation, and vertigo (i.e. "floating on air").