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Related Experiment Videos

Reinforcement learning in child molesters.

Tineke Dillien1,2, Kris Goethals1,2, Bernard Sabbe1,3

  • 1Collaborative Antwerp Psychiatric Research Institute (CAPRI), Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium.

Criminal Behaviour and Mental Health : CBMH
|November 28, 2018
PubMed
Summary

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Child molesters exhibit reinforcement learning deficits, particularly non-paedophilic individuals. These learning impairments may hinder therapy effectiveness, suggesting a need for targeted interventions before treatment begins.

Area of Science:

  • Neuroscience
  • Psychology
  • Forensic Science

Background:

  • Child molesters display rigid, maladaptive behaviors.
  • Reinforcement learning impairments may underlie these tendencies but require investigation.
  • Subtype differences in these impairments are unknown.

Purpose of the Study:

  • Investigate reinforcement learning impairments in child molesters.
  • Examine differences in these impairments across child molester subtypes.

Main Methods:

  • Recruited 59 child molesters via prison records and interviews.
  • Included comparison groups of 33 non-sex offenders and 36 non-offenders.
  • Administered a probabilistic reversal learning task to assess contingency learning.

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Main Results:

  • Child molesters made more errors than non-offenders on the learning task.
  • Non-paedophilic child molesters showed worse performance than paedophilic child molesters.
  • Age may confound comparisons between child molesters and non-offenders.

Conclusions:

  • Child molesters, especially non-paedophilic, have deficits in learning and reversing contingencies.
  • These reinforcement learning deficits may impede therapeutic progress without preliminary intervention.
  • Pre-program testing can guide resource allocation for targeted interventions.