Other studies, such as one done by Beran & Evans, indicate other qualities that humans share with non-human primates, namely the ability to self-control. In order for chimpanzees to control their impulsivity, they use self-distraction techniques similar to those that are used by children. Great apes also exhibited ability to plan as well as project "oneself into the future", known as the process of mental time travel. Such complicated tasks require self-awareness, which great apes appear to possess: "the capacity that contribute to the ability to delay gratification, since a self-aware individual may be able to imagine future states of the self".