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Sacks put this query to people with autism, migraines, Tourette’s syndrome, agnosia.

One common symptom of dementia is agnosia, the inability to recognize people, objects, smells or other sensations, McKay says.

If so, you might have face blindness—officially called prosopagnosia, from the Greek word prosopon, meaning face, and agnosia, meaning ignorance.

He suffers from extreme visual agnosia and is unable to distinguish between things and the representation of things.

D.F.’s entry into the case history annals came about because, as a result of her injuries, she could not recognize everyday objects, a condition called visual agnosia, yet she was still able to grasp them.