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Published: 16th December 2018     

Bullying can lead to physical structural changes in the brains of adolscents, study finds

The research was led by Erin Burke Quinlan of King's College London, UK and is the first to show that chronic peer victimisation during adolescence impacts mental health

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30 percent of young people could be victimised in one way or another by their peers

According to a new study, effects of being bullied are more than just psychological. Research shows that there may be physical structural differences in the brains of adolescents who are regularly victimised and this could increase the chance that they suffer from mental illness.

The findings of the study were published in the journal 'Molecular Psychiatry'. The research was led by Erin Burke Quinlan of King's College London, UK and is the first to show that chronic peer victimisation during adolescence impacts mental health via structural brain changes.

Burke Quinlan and her colleagues analysed data, questionnaires and brain scans of 682 participants from England, Ireland, France and Germany. These participants were part of the IMAGEN long-term project that assessed the brain development and mental health of adolescents. As part of this project, high-resolution brain scans of participants were taken when they were 14 and 19 years old.

At the ages of 14, 16 and 19 these participants also had to complete questionnaires about whether they had been bullied, and to what extent. Overall, the results showed that 36 of the 682 young people were found to have experienced chronic bullying. The data of these participants were compared with those of the others who had experienced less chronic/severe bullying. Changes in brain volume, as well as the levels of depression, anxiety and hyperactivity at the age of 19, were taken into account.

The subsequent findings validate and extend the literature linking peer victimisation with mental health problems. But the novel finding is that bullying is linked to decreases in the volume of parts of the brain called the caudate and putamen. These changes were found to partly explain the relationship between high peer victimisation and higher levels of general anxiety at the age of 19.

"Although not classically considered relevant to anxiety, the importance of structural changes in the putamen and caudate to the development of anxiety most likely lies in their contribution to related behaviours such as reward sensitivity, motivation, conditioning, attention, and emotional processing," explained Burke Quinlan.

According to the researcher, it is worrying that as much as 30 percent of young people could be victimised in one way or another by their peers, with some having to endure such treatment on an almost daily basis.

Burke Quinlan emphasizes that adolescence is not only a time of new experiences and stresses but also a period of extensive brain development. Therefore, she recommends that every effort should be made to limit bullying before it becomes a severe problem that might lead to changes in a young person's brain and the development of mental health issues.

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