A neurocognitive mechanism that may become disarrayed in PTSD is the threat monitoring system. This system is responsible for monitoring potential threats and for generating adequate behavioral and emotional responses to an ever changing environment. Recent studies have shown that this system is impaired in PTSD (Iacoviello, et al., 2014; Naim, et al., 2015) and that Attention Control Training (ACT), which balances the system's activity, is related to improvement in PTSD symptoms (Badura-Brack, et al., 2015). Therefore, the aim of the current study is to explore the efficacy of the ACT in preventing the development of PTSD during the period near after the traumatic event and before PTSD is developed.