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Related Experiment Videos

Differentiating rapists and non-offenders using the rape index

A Eccles1, W L Marshall, H E Barbaree

  • 1Kingston Sexual Behaviour Clinic, Queen's University, Ontario, Canada.

Behaviour Research and Therapy
|June 1, 1994
PubMed
Summary
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Phallometric rape indices, measuring sexual arousal to rape scenarios, failed to distinguish rapists from non-offenders. Even stimuli emphasizing degrading elements did not improve this discrimination, challenging previous findings.

Area of Science:

  • Forensic Psychology
  • Sex Offender Behavior Analysis

Background:

  • Previous research suggested phallometric rape indices could differentiate rapists from non-offenders.
  • However, doubts exist regarding this assertion, particularly for non-sadistic offenders.

Purpose of the Study:

  • To test if emphasizing degrading elements in rape stimuli improves the discriminability of rapists.
  • To investigate the relationship between rape indices and offenders' histories.

Main Methods:

  • Audiotaped stimuli describing consensual sex, brutal assaults, and degrading rape elements were used.
  • Rape indices were derived from sexual responses to these stimuli.
  • Indices were compared between rapists and non-offenders and correlated with offense histories.

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Main Results:

  • Rape indices derived from physically brutal or degrading rape elements did not discriminate between rapists and non-offenders.
  • These indices showed no significant relationship with offense histories.

Conclusions:

  • The findings challenge the utility of phallometric rape indices in differentiating rapists, especially when focusing on degrading elements.
  • Implications for the assessment and theoretical understanding of rapist behavior require further consideration.