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What is “agnosia”?

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The term “agnosia” refers to an inability or impaired ability to recognize things through visual, auditory, tactile, or olfacotry inputs, even though the senses themselves are intact. So it is common to think of “agnosias” as impairment of higher-order perception despite tha fact that basic sensory prerequisitesare unaffected. Curiously, the term was introduced by Sigmund Freud, who had a distinguished career in what today would be called “behavioral neurology” before he fathered psychoanalysis.

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