Plural of agnosia; medical conditions where people lose the ability to recognize things (like faces or objects) even though their senses work fine.
From Greek a- (without) + gnosis (knowledge), coined in the 1800s by neurologists to describe mysterious recognition failures that puzzled doctors because patients could see but couldn't identify.
Your brain has specialized 'recognition teams' for faces, objects, and sounds—agnosias happen when one team gets damaged while the rest keeps working, which is why someone might recognize their friend's voice but not their face.
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