Aggressive Behaviour, Mental Sub-normality and the XYY Male

@article{Jacobs1965AggressiveBM,
  title={Aggressive Behaviour, Mental Sub-normality and the XYY Male},
  author={Patricia A. Jacobs and Muriel Brunton and MARIE M. Melville and Robert P. Brittain and W. M. F. McClemont},
  journal={Nature},
  year={1965},
  volume={208},
  pages={1351-1352}
}
IT is well known that 1 per cent of males in institutions for the mentally sub-normal are chromatin-positive and that the majority of these have an XXY sex chromosome constitution1. In 1963 Forssman and Hambert2 reported on a survey of the nuclear sex of 760 male patients in three Swedish institutions for criminal and ‘hard-to-manage’ males of sub-normal intelligence. They found 2 per cent to be chromatin positive, but the chromosome constitution of these patients was not reported. Casey… 
Psychopathy, Mental Deficiency, Aggressiveness and the XYY Syndrome
TLDR
Preliminary findings are reported from a survey in a comparable population in the United States of mentally sub-normal male patients with “dangerous, violent or criminal propensities” found that seven of 197 inmates had an XYY sex chromosome constitution.
an XYY complement . normal males and males with Testosterone excretion rates in
The incidence of males with an XYY chromosome complement in a maximum security hospital was found to be 3% (Jacobs et al., 1965). These males were exceptionally tall, and it was found that 1 in 3 of
Testosterone excretion rates in normal males and males with an XYY complement.
The incidence of males with an XYY chromosome complement in a maximum security hospital was found to be 3% (Jacobs et al., 1965). These males were exceptionally tall, and it was found that 1 in 3 of
Chromosome errors in men with antisocial behavior. Comparison of selected men with Klinefelter's syndrome and XYY chromosome pattern.
TLDR
A wide spectrum of criminal offenses and psychopathology, including psychosis, was manifested in both groups, and the Klinefelter males of this series displayed a mean intelligence quotient of 80 as opposed to 84 for the 47,XYY males.
Criminal Behaviour and the XYY Male
TLDR
The most remarkable finding in the completed survey was the discovery among 315 men of nine patients with an XYY sex chromosome constitution, and their behaviour has now been closely studied.
Neurological Abnormalities in XYY Males
THE report by Jacobs et al.1 on seven XYY males found among patients in an institution providing special security conditions of confinement for patients with violent or otherwise dangerous
Childhood of males with the XYY syndrome
TLDR
An investigation of the childhood of 20 adult males and 2 boys with the XYY syndrome, ranging in age from 6 to 58 years at the time of diagnosis, indicated that truancy, vagabondage, impulsiveness, and difficulties at school and in establishing contact with people were more frequent among patients with karyotype 47,XYY.
Two New Cases of XYY Chromosome Complement: And a Review of the Literature
  • B. Hoffman
  • Medicine
    Canadian Psychiatric Association journal
  • 1977
TLDR
It is not yet known whether an XYY genotype results in a characteristic phenotype, so a genetic study of a normal population and a prospective study of newborns with various genotypes are needed which would create complex research and ethical problems.
47, XYY Karyotype and Borderline Personality Disorder: An Italian JudicialCase and a Review of the Literature
During the 1960s and the 1970s, some studies postulated that Jacobs' Syndrome can lead to aggressive and/or criminal behavior, but the statistical certainty was questioned. In the 1990s new
Crimino-biologic study of patients with the XYY syndrome and Klinefelter's syndrome
TLDR
12 psychopathic patients with chromosome aberrations found among 480 individuals in two institutions for criminal psychopaths in Denmark have been crimino-biologically investigated and psychoinfantile personality is pronounced in 5 patients with Klinefelter's syndrome.
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