We are unique creatures in that we can mentally simulate situations by remembering the past and visualizing the future. We can also play a hand at perhaps creating the future — at least in terms of preparing our emotional state for what may come. It's a valuable tool and one that can lead to happiness when applied to specific goals. There is much research behind visualization and emotional changes, as it has been shown that positive thoughts have an impact on the brain's biochemistry. Many psychologists ask people to imagine or picture what they would like in their life, creating a mental state that makes the person think that it is achievable. "If you experience that visualization with your eyes closed, your mind doesn't know if it's real or unreal," says Mary Ann Troiani, co-author of Spontaneous Optimism. "Neuropsychological ways makes them feel as though they have it and tricks the mind into thinking they have [what they are visualizing] now. It makes them more confident about it."