Disorders of consciousness can be grouped into two classes: local disorders and global disorders. Local disorders of consciousness involve circumscribed deficits to a particular domain of conscious processing. Blindsight is perhaps the most well-known of all local disorders of consciousness. Patients with blindsight have lesions in the visual cortex that result in a loss of conscious experience for stimuli presented to certain regions of their visual field. Global disorders of consciousness do not involve focal deficits of this kind, but instead involve impairments to the subject’s overall state of consciousness-they are domain-general rather than domain-specific.