The Biological Underpinnings of Peer Victimization Tracy Vaillancourt, Ph.D. Professor and Canada Research Chair, Children’s Mental Health and Violence.

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Presentation transcript:

The Biological Underpinnings of Peer Victimization Tracy Vaillancourt, Ph.D. Professor and Canada Research Chair, Children’s Mental Health and Violence Prevention Counselling, Faculty of Education, uOttawa School of Psychology, Faculty of Social Sciences, uOttawa Department of Psychology, Neuroscience & Behaviour, McMaster University

Divergent Pathways Exposure to Bullying Good Physical and Mental Health Poor Physical and Mental Health Moderated and/or Mediated Nature of abuse Social support Temperament Biology?

Genetic Evidence

Depression Risk S = Short *Allele L = Long Allele; Allele= 1 of 2 or more forms of a gene

see also Iyer et al., 2013 ; Sugden et al., 2010; Banny et al., 2013

Neurophysiological Evidence

“I feel like, emotionally, they have been beating me with a stick for 42 years”

Studies show that people can relive and re- experience social pain more easily than physical pain and the emotions they feel are more intense and painful. – Chen, Williams, Fitness, Newton, 2008 Physical pain is often short lived whereas social pain can last a life time.

Neuroimaging studies shown that parts of cortical physical pain network also activated when a person is socially excluded Physical & social pain share similar neural structures Linked to evolution ↑ survival among mammalian species Rejection is differentiated in less than 500 ms by children (Crowley et al., 2010) Using event-related potentials (ERPs) to study neural activity that occurs when a person is rejected

Neuroendocrine Evidence

Peer Victimization Depression HPA dysregulation Disrupted Neurogenesis  McDougall & Vaillancourt, 2013  Kliewer, 2006; Knack et al., 2011; Ouellet-Morin et al., 2011; Vaillancourt et al., 2008, 2011  Holsboer, 1995; Markopoulou et al., 2009; McEwen 2003; Stoke & Sikes, 1987  Horna et al., 1997; Leon-Carrion et al., 2009; Michopoulos et al., 2008  Vaillancourt et al., 2011     

Poorer Memory HPA Dysregu DepPeer Vic

“Results from this natural experiment provide support for a causal effect of adverse childhood experiences on the neuroendocrine response to stress”.

Telomere Erosion Telomere--repetitive nucleotide sequence (TTAGGG) at the end of chromosomes which promotes “chromosomal stability and also regulates the cells’ cellular replicative lifespan” (Kiecolt- Glaser et al., 2011, p. 16). Linked to normal processes like aging and associated with – health behavior e.g., smoking and obesity – diseases e.g., cancer, dementia, diabetes, and cardiovascular problems Shorter telomere length linked to psychological stress and mortality. Vaillancourt et al., 2013 for review

Vaillancourt et al. (2010a, 2010b, 2013) suggest, understanding biological underpinnings of peer relations helps legitimize the plight of peer- abused children and youth Encouraging policy makers and practitioners to prioritize the reduction of school bullying