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A learning disability refers to retardation, disorder, or delayed development in one or more of the processes of speech, language, reading, writing, arithmetic, or other school subject resulting from a psychological handicap cause by a possible cerebral dysfunction and/or behavioral disturbances. It is not the result of mental retardation, sensory deprivation, or cultural instructional factors.
What is Dr. Samuel Kirk's definition of the term learning disabilities during the emergent period?