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Psy - Criminal Behaviour - Mednick et al

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Fraser Waters

on 29 September 2012

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Transcript of Psy - Criminal Behaviour - Mednick et al

Adoption study (1984) Mednick et al Aim - to investigate whether criminal behaviour is affected to a greater degree by nature or nurture
Procedure - The study was carried out in Denmark; the criminal records of over 400 males born between 1924 and 1947 were compared with that of their biological parents and their adoptive parents Results - the results show that if a persons biological parents were convicted of a crime, they were more than twice as likely to be convicted of a crime the selves. However, if their adoptive parents had been convicted of a crime,
this had far less of an effect
A strong correlation was shown between biological parents and their sons for property crimes, also if a biological parent had three or more convictions, their sons were more likely to be convicted as well
Siblings raised in differing environments had a 30% chance of both committing a crime, while adoptive siblings (in the same environment) had only an 8% chance of doing likewise Biological parents Adoptive parents Convicted Not convicted Convicted criminal(s) Not convicted criminal(s) 24.5% 14.7% 20.0% 13.5% Conclusions - Mednick et al concluded that genetics played a greater role in the development of criminal behaviour, as opposed to environmental factors, however the environment was not considered irrelevant.
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