The causes of psychiatric disorders are poorly understood. Now, in work led by researchers at McGill University, there is evidence that a wide range of early onset psychiatric problems (from depression, anxiety and addictions to dyslexia, bulimia, and ADHD) may be largely due to the combination of just three factors. The first is biological—in the form of individual variability in the brain’s dopamine reward pathway. The second is social—and points to the important role of early childhood neglect or abuse. And the third is psychological—and relates to temperament, and particularly to tendencies toward impulsivity and difficulty controlling emotions. These findings have implications for understanding both the causes of a wide range of psychiatric disorders and the features worth targeting in early intervention efforts.
“Until recently, it was thought that psychiatric disorders reflected discrete disease entities, each with their own unique causes,” says Marco Leyton, the senior author on a recent study published in Neuropsychopharmacology and a professor in McGill’s Department of Psychiatry and Senior Scientist at the Research Institute of the McGill University Health Centre. “The present research upends this idea, suggesting instead that most early onset disorders largely reflect differential expressions of a small number of biological, psychological and social factors.”
First study to combine three key factors: Temperament, trauma and dopamine
Earlier research has suggested that each of the three factors, in isolation, has at least modest effects on the development of psychiatric disorders. In comparison, the authors of this new study had the first-ever opportunity to examine all three factors together. Fifty-two young people, living in the Montreal or Quebec City areas (30 women and 22 men), who have been followed since birth by Jean Séguin (Université de Montréal) and Michel Boivin (Université Laval), had brain imaging scans (PET and MRI) that measured features of their dopamine reward pathway. These brain features were then combined with information about their temperamental traits and histories of early life adversity.
High accuracy and potential predictive value of approach
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