Die Sprachentwicklung von Ein-und Zweieiigen Zwillingen und die Vererbung von Sprachstörungen

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Abstract
Summary The genetic roots of speech development in children are being investigated. On the basis of observations in the development of speech in 12 monozygotic twin pairs it could be shown that not only the retarded but also the normal development of speech is an idiotypic characteristic. It must be considered however, that we are not dealing with a simple characteristic, but with the result of a whole complex (intelligence, type of immagination, fine-motor and vitality) of the mentioned root. Further examinations regard the disposition for stammering. On the basis of research with monozygotic twins, of which one partner during the examination presented only signs of cluttering, the other one, however, clonic-tonic stammering, while both twins had a pathologic electroencephalogram, the hereditary basis of speech defects and stammering is shown. However, only in half of the cases of monozygotic twins one can find a disposition for dyslalia, which can be of a very different (periphercentral) nature.

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