Color agnosia
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Color agnosia (agnosia: Greek for non-knowledge) is a medical or psychological condition that prevents a person from recognizing colors (even though the eyes are capable of distinguishing them). It is a specific form of agnosia, and generally results from damage to the visual cortex, often in V4 (as opposed to most other kinds of color blindness, which derive from photoreceptors.
It is also known as "central achromatopsia".
It should be distinguished from color anomia, which is a condition where the patient can distinguish between colors but cannot connect those colors to their names.
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