Uncertainty Can Be Frustrating. As a rule, humans prefer certainty to uncertainty. Studies have shown that people would rather experience an electric shock than the idea of being shocked later. This study has also shown that there is greater nervous system activation when waiting for an unpredictable shock than an expected one. Where people differ is in the degree to which uncertainty bothers them. This apprehension of the lack of certainty is very evident in all aspects of our lives. The most common would be fear itself.