It is caused by the presence of an extra Y chromosome.
Abstract This psychological study of the personalities of XYY- and XXY-men is part of a multidisciplinary investigation of non-institutionalized males with sex chromosome aberrations.
Past and present views on these conditions have presented contradictory statements reflecting the enthusiasm with which abnormalities have been sought and recorded in studies of newly discovered conditions - not always with due respect to the validity of the methods applied.
Methodological flaws include sampling bias, generalizations unacceptably made on single cases, lack of control groups, lack of a blind evaluation procedure and finally lack of sufficient broad-spectred data.
Thus an impetus to reassessment of the sex aneuploid groups presents itself. Though four hypotheses have been set forth, it has not necessarily been in search of one universally appropriate theory. In matters as complicated as these concerning interrelations of biological, psychological and social factors, it does not enhance scientific thinking to try to make straight-line cause-and-effect connections; it is important to attack the question from different perspectives, and one theory does not make another redundant.
This procedure has not elicited a cacophony of ideas from so many diverse sources, that it is difficult to distinguish the nature of the issues, which are under discussion. On the contrary, in the attempt to examine the four hypotheses a picture has emerged: This does not show any inconsistencies or controversies regardless of the perspective from which it is seen - thus manifesting the force of inner coherence.
The first hypothesis deals with the question whether or not distinctive XYY- and XXY-syndromes of psychological features exist.
The comparisons of the total amount of data stemming from the XYY-men and the XXY-men lead to the statement, that the two groups are more alike than different. Both groups show a slight general deficit in global intelligence, but a wide spectrum of IQ scores is possible in both conditions.
There is no evidence of different cognitive styles. Regarding personality both sex aneuploid groups seem to have more than less characteristics in common.
The diversities manifesting themselves belong mainly to the sexual domain:Get ready to test your knowledge of Klinefelter and XYY syndrome with this interactive quiz.
Printing the associated worksheet puts you in control. IMPULSE, AGGRESSION AND SEXUALITY IN THE XYY SYNDROME JOHN MONEY* RONALD J. GAsKIN** AND HARRY HULL** INTRODUCTION Aggression has been much publicized as a feature of the XYY .
35 rows · Jan 14, · 47, XYY syndrome is a syndrome (group of signs and . Study design. This is a cross-sectional descriptive study of male subjects with XYY who were evaluated at 1 of 2 specialized academic sites.
Subjects underwent a history, physical examination, laboratory testing, and cognitive/behavioral evaluation. Viewpoint: Yes, the best studies of XYY males indicate that they are more prone to aggressive behavior than XY males.
The XYY syndrome is a genetic irregularity that gives the male an extra Y chromosome. 47,XYY syndrome is characterized by an extra copy of the Y chromosome in each of a male's cells. Although many males with this condition are taller than average, the chromosomal change sometimes causes no unusual physical features.