The problem of forgetting educational material
The main difficulty in preparing for an exam session is not learning the material, but retaining it in memory for a long time. According to the forgetting curve, about 80% of information is lost within just 24 hours after reading, and forgetting progresses in the absence of repetition. For a medical student, this means that topics covered in junior years (biochemistry, histology, normal physiology) simply do not stay in memory by the clinical disciplines if they were not worked with correctly.
For material to pass from short-term to long-term memory, two tools are needed: a semantic support (anchor) and a properly structured system of repetitions. Simply rereading a study guide multiple times is ineffective and creates only an illusion of knowledge.
Anchors as the basis of long-term memorization
An anchor is a short word, phrase, or image that condenses an entire topic into a compact structure and evokes an emotional or logical response. Unlike classical mnemonics, an anchor integrates into personal experience and is not forgotten years later.
Example from biochemistry: beta-oxidation of higher fatty acids is condensed into the OHOT sequence:
- O — oxidation (oxidation of acyl-CoA by FAD-dependent acyl-CoA dehydrogenase);
- H — hydration (hydration of enoyl-CoA to form β-hydroxyacyl-CoA);
- O — oxidation (repeated oxidation by NAD-dependent dehydrogenase to β-ketoacyl-CoA);
- T — thiolysis (thiolytic cleavage by thiolase with the release of acetyl-CoA).
A similar principle is used in other disciplines — for example, the phrase "chest, back — for the driver a wall" helps remember traffic controller signals in forensic medicine or life safety.
Anchor vs. mnemonic: what is the difference
A mnemonic is a ready-made memorization scheme that a student receives from an external source. The problem with mnemonics is that they do not "stick" well to memory if they are not personally connected to the student: someone else's mnemonic is forgotten almost as quickly as the original material.
An anchor works differently:
- it is created or adapted independently;
- it is connected to an emotion, image, or logic of the subject;
- it condenses not individual words, but the structure of the topic (sequence of reactions, links of pathogenesis, classification);
- it unfolds back into a complete answer when recalled.
Therefore, it is recommended to rework external mnemonics from textbooks and courses into your own associations rather than memorizing them in their original form.
Spaced repetition and the rule of ones
Spaced repetition is a method where material is recalled at increasing time intervals. Each repetition "lifts" the forgetting curve, and each time the volume of retained information grows.
The optimal scheme is the rule of five ones:
- immediately after studying;
- in 1 hour;
- in 1 day;
- in 1 week;
- in 1 month.
During exam sessions when time is short, the first three ones are enough: immediately — in an hour — in a day. This is enough to confidently retain the material until the exam. The full scheme of five repetitions is needed when the goal is to keep the topic for clinical courses and practical work.
Repetition technique: source and recall
There are two complementary ways of repeating.
- Working with the right source — watching a high-quality lecture or reading verified material where semantic accents are already placed and anchors are proposed. The key criterion for a source is the presence of structure and a clear explanation, rather than the volume of text.
- Active recall — reproducing a topic out loud or in writing without peeking. It is active retrieval from memory that consolidates neural connections stronger than passive reading.
Recall always starts with a scheme: first, the structural framework of the topic is drawn, and only then is it filled with details. The scheme serves as support when answering any additional questions from the instructor.
Example of recall via a scheme
Topic: the role of aromatase (CYP19) in male sexual function. Recall scheme:
- initial link — aromatase enzyme in adipose tissue;
- substrate — androgens (testosterone), which are converted into estrogens;
- consequence — decrease in the level of androgens necessary for the function of NO synthase in the corpora cavernosa;
- NO synthase ensures the relaxation of the smooth muscles of the penile blood vessels and erection;
- with increased aromatase expression, the androgen background decreases → NO synthase activity drops → smooth muscle relaxation is impaired → erectile dysfunction develops.
Such a scheme is memorized once and reproduced at any moment because it relies on a logical chain rather than memorized text.
Key points
- Without special techniques, about 80% of the material is forgotten within just 24 hours after studying.
- Long-term memorization is built on personal anchors, not someone else's mnemonics.
- An anchor condenses a topic into a short structure (example: OHOT for beta-oxidation).
- External mnemonics must be adapted to your own associations.
- The optimal scheme is the rule of five ones: immediately, in an hour, a day, a week, a month.
- During exam sessions, three repetitions are enough: immediately — in an hour — in a day.
- Repetition is effective when combining a quality source and active recall.
- Any recall starts with a scheme — it serves as support during an oral exam.