  By appealing to some putative features of our cognitive architecture,  Gerrig claims that people are unable to effectively make use of their knowledge of the outcome of a story in such a way that would preclude suspense. Gerrig offers an evolutionary psychological explanation of  how this could be possible. He argues that evolution has not equipped humans with the ability to look up known outcomes to repeated events. Since there are no exactly repeated events in nature, there was  simply no selective pressure to develop such an ability. As such,  repeaters can feel suspense, because while they are caught in the  grips of a story they are unaware of the outcome. In this way, Gerrig argues, fictional scenarios can be effectively uncertain for viewers  even if they know the outcome. 