Researchers have long wondered if there is an upper limit to our capacity to store memories and how we manage to remember so many events without mixing up events that are very similar.
Ailin Moser, daughter of 2014 Nobel Laureates May-Britt and Edvard Moser, drew this picture of a house to illustrate how the method of loci works. If you wanted to remember the countries of South America, for example, you might imagine a seal playing a brass instrument in one room in your house to remember Brazil, and chili peppers in another room to remember Chile.
Credit: Image:Ailin Moser
Place cells in the hippocampus: Eleven maps for eleven rooms. Charlotte B. Alme, Chenglin Miao, Karel Jezek, Alessandro Treves, Edvard I. Moser, May-Britt Moser. Proceedings of the National Academy of Sciences. 8 December 2014. doi: 10.1073/pnas.1421056111