The memory palace for dental students: how the method of loci works

What a memory palace is

A memory palace stores information in two layers. The place gives you the order, because a route has a first stop, a second stop and a last stop. The images give you the content, because each stop holds one striking picture that stands for the fact you want to keep. To recall, you do not search your memory for a list. You walk the route and look at what is waiting at each stop.

The place can be your home, your hostel corridor, the road to your college or a hospital ward you know well. What matters is that you can walk it in your head without effort. That is why the same technique has been used by orators, by memory athletes, and now by students who need to hold thousands of facts.

The story of Simonides and the banquet hall

The oldest tale about the method comes from Cicero, who tells it in De Oratore. The Greek poet Simonides of Ceos was performing at a banquet in Thessaly hosted by a nobleman named Scopas. Partway through the evening a message came that two young men were waiting for him outside. Simonides stepped out and found nobody. While he was away the roof of the hall collapsed and crushed the guests so badly that their families could not tell them apart.

Simonides could name each victim, because he remembered exactly where every guest had been sitting at the table. In Cicero's telling, this made him realise that orderly places help memory, and that images placed in those places can stand for the things you want to recall.

Scholars treat the banquet as legend rather than recorded history, so it is best read as the tradition's origin story. The principle it carries is the useful part. Roman rhetoric handbooks, including the Rhetorica ad Herennium, later set out the method as a set of rules for choosing places and forming images, because orators had to deliver long speeches without notes.

How to build a memory palace in five steps

1. Choose a place you know well. Use your home, hostel, college or a daily route. You should be able to walk it with your eyes closed.
2. Fix a route and number the stops. Always walk in the same direction. Start with five to ten stops, such as the gate, the path, the front door, the sofa and the kitchen table.
3. Turn each fact into an image. Make the image vivid, unusual and active, and link it to the fact by meaning or by sound. A dull image fades. A strange one sticks.
4. Place the image at the stop and let it act. Do not just picture it sitting there. See it move, hear it, feel it. Action and emotion make the scene memorable.
5. Walk the route to recall, then check the source. Say the facts aloud in order. Correct anything wrong against your textbook, then walk the route again after a day, three days, a week and three weeks.

The last step matters most. Recalling from the palace is retrieval practice, and revisiting it on a schedule is spaced repetition. Both are well supported by research on learning (Roediger and Karpicke, 2006; Cepeda and colleagues, 2006).

A dental example: the divisions of the trigeminal nerve

Suppose you need to remember which skull opening each division of the trigeminal nerve uses. Understand the pathway first, then place it along a short route: three doors in a corridor.

1. 1
   A door with a wide letterbox slit at eye level

   An eye peers through the slit. The eye stands for the ophthalmic division, V1. A slit is a fissure, so this door stores the superior orbital fissure.

2. 2
   A round door guarded by someone puffing out a cheek

   The cheek stands for the maxillary division, V2, which supplies the midface. Round gives you foramen rotundum.

3. 3
   An oval door with a jaw chewing on the frame

   The jaw stands for the mandibular division, V3. Oval gives you foramen ovale, and the chewing reminds you that V3 carries motor fibres to the muscles of mastication.

Notice what the images do and what they do not do. They hold the association between a division and its opening. They do not explain what each nerve supplies or why a lesion matters clinically. Learn that first, then let the palace protect it. This is the idea behind the name SketchRoot: root the picture in the science before you draw it.

What the research says

The evidence for the method of loci is real, but it has limits, so it helps to know exactly what each study found.

• Maguire et al., 2003. The authors studied people who compete in the World Memory Championships. Their superior memory was not explained by unusual intelligence or by differences in brain structure. They used a spatial learning strategy that engaged brain regions important for memory, including the hippocampus.
• Dresler et al., 2017. Ordinary participants trained with a mnemonic method for six weeks. Their brain network connectivity moved toward the pattern seen in memory athletes, and that similarity predicted memory gains up to four months later.
• Legge et al., 2012. Novices used the method of loci on lists of unrelated words. A virtual environment studied only briefly worked as well as a highly familiar real place, so the place does not need to be elaborate.
• Qureshi et al., 2014. In a medical teaching study, students taught insulin and diabetes with lectures plus memory palaces scored higher on assessments than students taught with lectures plus self directed study.

Read these results with care. Most laboratory work uses word lists, memory champions are not typical students, and the medical teaching study covered a single topic in a small group. No trial has tested the method in dental entrance examinations. The fair conclusion is that the method of loci is a strong tool for ordered material, best combined with active recall and spaced revision.

Where it helps in dentistry, and where it does not

A memory palace suits material with an order or a set of parts: the branches of a nerve or artery, features of a syndrome, drug classes with their adverse effects, classifications, stages of a disease and steps of a clinical procedure. It also suits questions that ask you to pick the odd one out, because you can walk the route and see what belongs.

It does not replace reasoning. A palace cannot teach you how to work out a diagnosis, weigh a treatment option or read a radiograph. Those need understanding and practice. Use the palace to store facts you already understand, and use questions and cases to test whether you can apply them.

Common mistakes

• Too many facts at one stop. Keep one image and one idea per stop, and add stops instead of crowding one.
• Images that are too ordinary. If you cannot see it, hear it or laugh at it, it will not last.
• Building and never testing. A palace you never walk is just a daydream. Recall from it out loud and on a schedule.
• Encoding the wrong fact. A vivid mistake is harder to unlearn. Check every image against a trusted textbook before you rely on it.
• Reusing one palace for everything. Similar routes and images can blur together. Keep separate palaces for separate subjects.

How SketchRoot builds on the method

Designing a good palace takes time, and most students have neither the time nor a check on whether their images are scientifically right. SketchRoot is being built to remove that cost. Each high yield topic becomes one illustrated scene in which place, colour and absurdity lock the classification, mechanism, features and management together. The scenes are drawn and checked by clinicians who have topped these examinations.

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