Tuesday, 23 August 2016

Criminal Behaviour - Mednick et al (1984)

OUTLINE

The researchers took a sample of 14,000 adopted Danish men who were born between 1924 and 1947. They compared their criminal records to those of their adoptive and biological parents.

RESULTS


  • If they had convicted biological parents, they were nearly twice as likely to be convicted than adoptees who had biological parents who had not.
  • There was a strong correlation between biological parents and their sons for property crimes
  • If a biological parent had 3 or more convictions, it is more likely their son also would
  • If unrelated siblings were present, only 8% committed a crime
  • 20% of related siblings in different families committed a crime
  • If the biological father committed a crime, 30% of the sons also committed crimes
CRITICISMS

1 - Unreliable records
  • Criminals may not have been reported,detected, or convicted
  • Some convictions may not be fair
2 - The contamination effect
  • The adoptees spent time with their biological parents
  • Over 90% of the adoptees were adopted before the age of 2
  • Psychoanalysts think that early childhood affects you greatly
3 - The sample is culture biased and sex biased
  • All participants were male and from Denmark
  • Cannot be generalised to females or other countries.

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