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The presence of such a deficit is demonstrated by the pattern of clinical findings (Rutter, 1968; Rutter, Bartak and Newman, 1971), the long term course of the disorder (Rutter, 1970), and the results of systematic experimental studies (Hermelin and O'Connor, 1970). Nevertheless, basic questions remain concerning the meaning of this deficit for theories on the nature and causation of infantile autism. First, what are the boundaries of the cognitive deficit and in particular does it extend outside language? Second, does it constitute the primary handicap which gives rise to other symptoms? 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