#Handedness

A comprehensive analysis finds that people with mental and neurodevelopmental disorders are about 50% more likely to be left-handed or mixed-handed than those without such diagnoses. The large synthesis draws on data from more than 202,000 individuals across 402 datasets and highlights a potential link between brain lateralization and mental health risk. The work is published in Psychological Bulletin and integrates findings from ten previous meta-analyses plus 33 newly released studies. Researchers tracked how handedness intersected with age, sex, diagnosis, and measurement methods to build a clearer picture of this complex relationship.

A sweeping new meta-analysis has revealed that individuals with mental or neurodevelopmental disorders are about 1.5 times more likely to exhibit non-right-handedness — meaning left-handedness or mixed-handedness — than the general population, sharpening the focus on how biological factors may intersect with mental health. Published in the prestigious journal Psychological Bulletin, the study synthesizes an unprecedented dataset drawn from over 202,000 people and provides fresh insights into the subtle ways brain development may be linked to mental health risk (psypost.org).