The idea of cognitive energy preservation comes across quite intuitively. Humans tend to do what requires the least of them, if given the opportunity. The well known idiom “the path of least resistance” came about due to this natural desire to take the easy route. However, when added variables such as rewards, level of effort, and decision making come into play, it is preferable to know the parameters of cognitive energy preservation. Past studies of this preservation are reviewed in the .docx file under Literature Review.