There is growing evidence that genetic influences may cause some learning disabilities (Galaburda, 2005; Wood & Grigorenko, 2001). Hallgren (1950), in an early investigation, studied 276 children and identified numerous reading and language problems among the relatives of the children. A genetic link was suggested as one possible cause for the reading problems of the children. Decker and DeFries (1980, 1981) conducted a series of studies of 125 children with reading disabilities and their families, and the results indicated that reading disabilities may be hereditary.
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