Agnosia

A neurological condition in which a person has difficulty recognising familiar objects, faces, places, sounds, or other sensory stimuli despite intact basic sensory function and general cognition. Specific subtypes include visual agnosia (difficulty recognising objects or faces), prosopagnosia (face blindness), and auditory agnosia (difficulty recognising sounds). Agnosia commonly arises from stroke, traumatic brain injury, dementia, or other neurological conditions, and it is one of the classic '4 A's' of dementia-related cognitive change alongside amnesia, aphasia, and apraxia. Accessibility design for people with agnosia often leans on redundant, multimodal cues and the thoughtful placement of external information — for example, printed attendee rosters with names and brief biographies during a videoconference.