Humans use mental time travel involving dopamine and other neurotransmitters to set and reach goals.

“one of the key aspects to brain function however is to use that ability to try and set goals reach goals and that's a neurochemical process and I would say these days more than ever we operate on short time frame reward schedules meaning we want something we generally have ways of getting it pretty quickly or at least the information about how we might get it pretty quickly and we either get it or we don't and of course it involves dopamine and a bunch of other things as well”