Peak shift is a phenomenon in which animals do not respond to the previously rewarded stimulus but to a stimulus that is similar to that rewarded stimulus. Therefore, peak shift as a behavioural notion was normally used to explain false memory and misattribution of an event. However, we believe that how well an animal remembers an event will also contribute to the amount of the peak shift. Since no one had ever looked into this, we decided to do an experiment that assessed how does memory affects the peak shift. Also, the existing theories did not take account of memories; by doing this experiment, we can also test the existing theories/models and hopefully can refine those theories/models.