Psychol Med. 2023 Dec 4:1-9. doi: 10.1017/S003329172300346X. Online ahead of print. ABSTRACT BACKGROUND: We investigated (a) whether polygenic risk for schizophrenia predicts different trajectories of social development among those who have not developed psychoses and (b) whether possible associations are PRSSCZ-specific or evident also for any polygenic risk for mental…