About 0.1 per cent children are born with the XYY syndrome. Many of these children remain undetected and live functionally normal lives. Many of them, however, may experience physical, psychological or neuropsychological impairments. In order to design a proper treatment for these children an accurate diagnosis is needed. In this article the cognitive features associated with XYY syndrome and the cognitive skills of an XYY-boy are described and discussed in relation to some therapeutic findings.
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Lamminmäki et al. (1994) studied this question.
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