It is also crucial to find out which PTSD patients can benefit most from OXT-enhanced psychotherapy, because OXT has many person-specific characteristics, ranging from a person’s attachment style to oxytocin receptor gene variations which differentially influence OXT’s action in individuals (Bartz, Zaki, Bolger, & Ochsner, 2011; Olff et al., 2013). This evidence concerns the gene OXT and post-traumatic stress disorder.