Title: An extra X or Y chromosome: contrasting the cognitive and motor phenotypes in childhood in boys with 47,XYY syndrome or 47,XXY Klinefelter syndrome
Authors: Judith L. Ross, Martha P.D. Zeger, Harvey Kushner, Andrew R. Zinn, and David P. Roeltgen
Date of Publication: December 2009
A research article on comparing the similarities and differences in boys with 47,XXY and 47,XYY from a neurocognitive testing standpoint.