MEG Reveals Preference Specific Increases of Sexual-Image-Evoked Responses in 
Paedophilic Sexual Offenders and Healthy Controls

Krylova, M; Ristow, I; Marr, V; Borchardt, V; Li, M; Witzel, J; Drumkova, K; Harris, JA; Zacharias, N; Schiltz, K; Amelung, T; Beier, KM; Kruger, TH; Ponseti , J; Schiffer, B; Walter, H; Kärgel , C; Walter, M

doi:10.1080/15622975.2020.1789216

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MEG Reveals Preference Specific Increases of Sexual-Image-Evoked Responses in Paedophilic Sexual Offenders and Healthy Controls

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Walter, M
Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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https://www.tandfonline.com/doi/full/10.1080/15622975.2020.1789216
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Citation

Krylova, M., Ristow, I., Marr, V., Borchardt, V., Li, M., Witzel, J., et al. (2021). MEG Reveals Preference Specific Increases of Sexual-Image-Evoked Responses in Paedophilic Sexual Offenders and Healthy Controls. World Journal of Biological Psychiatry, 22(4), 257-270. doi:10.1080/15622975.2020.1789216.

Cite as: https://hdl.handle.net/21.11116/0000-0006-A9A3-3

Abstract

Objectives: Paedophilic disorder is characterized by sexual attraction towards children. Classification of a counterpart as sexually attractive likely occurs rapidly, and involves both conscious and unconscious attentional and cognitive processes. Magnetoencephalography (MEG) is an imaging method especially well-suited to examine visual and attentional processes triggered by sexual images within the range of milliseconds.Methods: We investigated brain responses to sexual images depicting adults (frequent) and children (infrequent stimulus) in seventeen paedophilic patients with a history of child sexual offending (P + CSO) and twenty healthy controls (HC) during a passive visual oddball paradigm. Event-related fields (ERF) were measured to extract the magnetic visual mismatch negativity (vMMNm), and how it relates to the processing of different classes of sexual stimuli.Results: P + CSO exhibited significantly longer vMMNm latencies (100-180ms post-stimulus) than HC. Moreover, P + CSO showed widespread increased amplitudes in response to child images starting from P3a and P3b components and lasting up to 400ms post-stimulus presentation localized in frontal and temporal brain regions.Conclusions: This study uncovers the first MEG differences in automatic change detection between P + CSO and HC during the presentation of subliminal sexual images of adults and children, contributing towards a better understanding of the neurobiological processes of P + CSO.