Marc Exposito, Oscar Rosello
The memory palace is an ancient greek technique that can be used to memorize (almost) anything. It is used for tasks such as remembering full decks of cards, historic dates, long lists of words or foreign language vocabulary. Many memory contest champions, including eight-time world memory champion Dominic O’Brien, claim to use this method (Jusczyk, 1980).
The memory palace is a mnemonic technique that involves populating an imaginary scene with mental images that will help us remember the content we intend to memorize. However, getting started with the memory palace can be a demanding cognitive task. For subjects that are not trained as spatial thinkers imagining a scene vividly can prove to be challenging. To address this problem, we propose to make the memory palace real: This means offloading part of the cognitive task dedicated to imagining scenes to reality by using the tangible architectural spaces that surround us. We use the fact we all know how to navigate space naturally and use that to our advantage. We propose to combine the memory palace technique with augmented reality technology to create a study tool that will help anyone memorize more effectively.
The memory palace technique
The memory palace technique works as follows: First, find a concept you want to memorize and use a visual mental symbol to help you remember that association. For example, if you want to remember that the Dallas Cowboys won the Super Bowl in 1972, you could imagine a cowboy on a rodeo. Second, take the image you just created and link it to an architectural scene. It can be a scene of a place you know or an imaginary scene. This means, that for example, you should imagine the cowboy in front your office. Finally, to recall your memories, imagine the scene we just created in your head. The Dallas Cowboys will naturally emerge.
In order to remember more that one concept, simply attach an adjacent mental scene and link a new mental image to that scene. When recalling the full sequence, you need to revisit those scenes mentally in order you dropped the concepts you intended to remember. Intuitively, it might seem a counter-intuitive strategy since you need to remember both a place and the actual content you want to remember, but it’s, in fact, the opposite: Current neurological research has proven spatial navigation and memory both relate to the same part of the brain, the hippocampus (O’Keefe, 1978). Brain scans of “superior memorizers”, 90% of whom use the method of loci technique, have shown that it involves activation of regions of the brain involved in spatial awareness, such as the medial parietal cortex, retrosplenial cortex, and the right posterior hippocampus (Maguire, 2002). This technique takes advantage of this fact to facilitate encoding, storing and retrieval of information.
We have taken a step towards understanding the role spatial navigation plays in memory augmentation by developing NEVERMIND, a learning interface that is in line with how memories are stored internally. This system is divided into two main parts. The first part is an iPhone application dedicated to user interaction. It has three different modes: Encode, Store, and Retrieve.
In Encode mode, users create routes and pair them with images. In Store mode, users can train memory based on once the content is set by physically visiting their memory palaces. In Retrieve mode, users can recover previous knowledge lists and link them to a specific route. Additionally, the system allows users to share knowledge content playlists with other users and pair them with their own memory palaces.
The second part of the interface is dedicated to the display of images and runs images on the Epson Moverio BT-300 augmented reality glasses. We developed a program that runs in the Unity3D video game engine that is responsible for receiving the images from the iPhone sends and displaying them on the glasses.
We have tested the NEVERMIND interface on five different subjects with favorable results. The subjects were asked to memorize two similar lists of 10 items, one using NEVERMIND and the second using a printed list of items. The tasks were not time constrained. Results showed all users were able to remember the lists immediately after running the test. However, all five subjects were able to remember the content of the list 24 hours after the experiment and none was able to accurately recall items on the printed list. When asked about the two study methods, users claimed that studying with the NEVERMIND interface was more enjoyable and nearly effortless compared to traditional study methods.
We tested the NEVERMIND interface on a list of 10 Super Bowl winners from 1967 to 1976. We verified that the subjects had no previous knowledge of the content to remember. For the experiments, we predefined the mental imagery for the users. For example, we used a picture of a man on a horse to represent the Dallas Cowboys or a picture of an airplane to represent the Houston Jets. In all cases, we used routes users were familiar with.
Reusing the palace
We conducted preliminary studies on the reusability of the palace. We used a location of the previous memory palace to remember 15 digits of Pi. Our intuition points that the most demanding part of the technique is loading the palace in your head for the first time. Once the palace is loaded, scenes can be reused to store other content effectively.
Our motivation is to change the way students memorize. We spend a long time memorizing based on repetition. In our experiments, we suggest that there are more effective methods that are in line with the way our brain stores information. We propose an experiential way of learning, where the retrieval process is the act of mentally aligning ourselves to the location.
We see potential uses in education, as a technique to bootstrap knowledge as a starting point before tracing associations and inferences that are characteristic of higher levels of understanding. This interface could be used, for example, to help biology students study. Other uses include public speaking, speeches, toasts, presentations etc.
Mixed reality: We are planning on implementing a mixed reality version of NEVERMIND. At the moment, the graphical content supplied by the interface is not anchored to a specific spatial location. When the user approaches the target location, the image appears. This means, that AR images move with the user’s head motion. We have the intuition that anchoring images accurately with reality will lead to more memorable results.
Chunking the palace: Controlling image placement accurately would also open up new features of the interface. For example, adding hierarchy to the palace. With this feature, the user could control the amount of detail the user wants to remember. This would lead to remembering a set of concepts at different levels of hierarchy. The essential content could be recalled just enough to make a 30 second elevator pitch to an investor, more details could be added to make a 7 minute pechakucha presentation or if we recall all the content, we could deliver a 20 minute presentation on an idea.
Video review: We are planning on adding a set of features that will allow revising or studying the content of the palace without the need of being physically there. A first implementation will include a recording of the routes as the user sees them with overlays of the images to remember. This would result in a video that could be played at 10x speed, slowing down when the content appears and resembling memory consolidation that goes on through the REM phases of sleep. The video should be easily played forward and backward to help the memorization process.
Knowledge playlists: Each user’s memory palace is personal, but the content to remember can be shared.
We propose a social platform to the share and download knowledge with friends or classmates. Each user can use their own palaces and populate them automatically with content downloaded from the web. Predefined graphic associations could be built in and the user could alter the content. This would build a database of concept-image pairings sourced from the community of users. Potential applications of this feature include bootstrapping content into the student’s memory before a class.
Is memory obsolete?
Conducting this study also raised several questions related to the relationship between memory and technology. Why memorize? What role does memory play in the learning process? Is memory still relevant in the age of Google? We are becoming symbiotic with our computer tools, growing into interconnected systems that remember less by knowing information than by knowing where the information can be found. However, we believe that memories are one of our most precious possessions; they grow with our experience and vanish when we die. Like Ebbinghaus states, mnemonic techniques such as the memory palace can increase our ability to retain it will help us preserve our personal experiences stored in memory.
Previous interfaces dedicated to augmenting memory include the Remembrance Agent (Rhodes, 1997), that proactively logged the information the user needed to remember. Other studies include the use of virtual reality to rehabilitate memory with patients suffering from Alzheimer’s (Brooks, 2003). There have been previous studies on the recreation of a virtual memory palace. Most methods involve either a computer simulation model or virtual reality (Legge, 2012). We found another example that pairs an early version of a head mounted display with an interpretation of the memory palace technique (Ikei, 2008). However, the design of the interface of the hardware, software and interpretation of the memory palace technique is substantially different from the one described here.
We designed a learning interface to make memorization more durable and enjoyable. We have designed a model to help users master memory based on the coupling of space and memory. We have implemented an interface prototype, NEVERMIND, that facilitates memory encoding, retrieval, and storage. We have shown experimentally that using our interface, memories become more durable and subjects claim that the process is more enjoyable and effortless. With this work, we hope to make the memory palace accessible to the general user. We have designed a new way to memorize, based on a symbiotic relationship with technology, that enables us to learn in line with how our brains store information.
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