Psychology Wiki: Dyscalculia

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Dyscalculia is defined as a specific learning difficultyaffecting a person’s ability to understand and/or manipulate numbers. Like dyslexia, dyscalculia can be caused by a visual perceptual deficit. Dyscalculia is often used to refer specifically to the inability to perform operations in math or arithmetic, but is defined by some educational professionals as a more fundamental inability to conceptualize numbers themselves as an abstract concept of comparative quantities. It is a lesser known disability, much like dyslexia anddyspraxia.

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Acalculia

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Acalculia (not to be confused with dyscalculia) is an acquired impairment in which patients have difficulty performing simple mathematical tasks, such as adding, subtracting, multiplying and even simply stating which of two numbers is larger. Acalculia is distinguished from dyscalculia in that acalculia is acquired late in life due to neurological injury such as stroke, while dyscalculia is a specific developmental disorder first observed during the acquisition of mathematical knowledge. The name comes from the Greek “a” meaning “not” and Latin “calculare”, which means “to count”.

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