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Albert Einstein, Leonardo Da Vinci, Thomas Edison, Winston Churchill, and Auguste Rodin. A disorder in one or more of the basic psychological processes involved in understanding or using language, spoken or written, which may manifest itself in an imperfect ability to listen, think, speak, read, write, spell, or do mathematical calculations. The term includes, but is not limited to conditions such as perceptual handicaps, brain injury, minimal brain dysfunction, dyslexia, and developmental aphasia. A type of learning disability where, despite conventional classroom experience, a person may have problems remembering and recognizing written letters, numbers, and words, might read backwards, and have poor handwriting. The term is frequently used when neurological dysfunction is suspected as the cause of the reading disability.