It has been shown that a testosterone–oxytocin imbalance can induce either empathy (and social sensitivity, when OXT release is more active than testosterone release) or autism (and self-centred perception, in the opposite case) (Montoya et al., 2012; Crespi et al., 2016; Procyshyn et al., 2020) and even aggression (van Anders et al., 2011). Here, OXT is linked to autism.