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An examination of dissimulation in sexual offenders presenting for assessment as measured by the Minnesota multiphasic personality inventories and responsiveness on the penile plehysmograph

7 April 2000


This research examines the relationship between response style in objective
measures and responsiveness on the penile plethysmography (PPG) in men presenting for psychological evaluation as a result of alleged sexual offending against children. The underlying hypothesis of this study is that men accused of sexual offenses who deny deviant sexual interests and behaviors may deny other unusual experiences as well. A review of the literature was conducted exploring the assessment of sexual offender, the use of objective psychological measures and the penile plethysmograph with offenders, and the nature of dissimulation in sexual offenders. The study examined 200 adult males (18 years of age or older) who had been evaluated at a community-based sex offender treatment facility as a result of legal charges alleging a sexual offense. Subjects were divided into two groups labeled as defensive and non-defensive based on the F-K scale
scores on the MMPI/2 and examined with regard to their response on the PPG. Results confirm the hypothesis and indicate that an individual identified as defensive on the MMPI/2 was significantly less likely to respond on the PPG. The F, K, F-K aiid O-S scales of the MMPI were all good predictors of this effect. The implications of this research, as well as the effect of demographics and assessment variables is discussed.


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