Introduction: Humans have a need to belong a group to survive. For this reason, people have enhanced cognitive abilities to detect cues about rejection. Thus, rejection from our group is a threatening situation like feeling personal uncertainty. According to Temporal Need Threat Model, ostracism may lead to personal uncertainty and situational ambiguity. Since being ostracized threatens people's need to understand their world, and to control how they should behave, it confronts people with personal uncertainty. According to our knowledge, there is no experiment providing a direct empirical evidence of this proposition about the role of uncertainty in ostracism. Thus, the goal of the present study was to assess the accessibility of uncertainty-related thoughts following ostracism manipulation.