Evidence-Based Learning and Memory Methods

The Bottom Line

For healthy adults, the most worthy priority for improving learning and memory effects is usually not supplements or so-called "brain training", but active recall, spaced repetition and high-quality sleep. A comprehensive analysis of 242 studies and 169,179 participants found that distributed practice and test practice were among the most effective learning techniques.

1. Active Recall

Recommendation: ★★★★★ Evidence: ★★★★★

Active recall is not about looking at the answer and having a familiar feeling of "already remembered", but first covering up the answer and then forcing yourself to find the content from memory. For example, when learning AWS Route 53 Resolver, don't read the definition five times in a row; close the information after understanding it once, and try to answer its purpose, and under what circumstances Inbound Resolver Endpoint and Outbound Resolver Endpoint are used.

If you can't answer, check the answer and try again after a while. This practice is called the retrieval practice or testing effect. The test here is not used to evaluate whether you are smart or not. Retrieval itself is part of learning.

A meta-analysis of 222 studies involving 48,478 students found that in-class testing or quiz-based learning resulted in an overall moderate improvement of about g=0.50 compared with mere review. Therefore, the more effective rhythm is not "study and then wait for the test", but "study, recall, check, recall again."

2. Spaced Repetition

Recommendation: ★★★★★ Evidence: ★★★★★

Instead of reading the same word 20 times on Sunday, learn it for the first time on Sunday, recall it once on Monday, and then again on Wednesday, the next Sunday, two weeks later, and a month later. The classic large-scale review included 254 studies and more than 14,000 participants, and the average recall rate was about 47% for distributed learning and 37% for massed learning.

The key to spaced repetition is not to mechanically wait, but to make retrieval slightly harder. If you just finish learning and repeat it immediately when the answer is still clear, the benefits will often be limited; when you feel that the content begins to be blurry, try to remember it again, which will form more valuable training.

3. Combining the Two: Spaced Retrieval Practice

The combination of active recall and spaced repetition forms spaced active recall, which is the main theoretical basis behind Anki, SuperMemo and various flashcard systems.

For example, when learning 20 Japanese words, you can read the Chinese prompts on the first day, recall the Japanese by yourself, and then turn over to check the answers; continue the test the next day, three days later, one week later, and one month later. The focus is always on "forcing yourself to remember" while gradually lengthening the review interval, rather than browsing Chinese and Japanese side by side over and over again.

4. Sleep

Recommendation: ★★★★★ Evidence: ★★★★★

Sleep is not a break from learning, but a part of the learning process. After learning new knowledge, the hippocampus forms new memory traces; during sleep, these traces undergo consolidation and reorganization, gradually becoming more stable long-term memories.

A 2024 study that summarized 19 systematic reviews and comprehensive analyzes concluded that sleep in healthy people can generally promote memory consolidation, especially for more complex declarative information. A comprehensive analysis of new word learning covering 25 studies and 1,396 people found that the overall advantage of sleep over staying awake was about g=0.50, of which free recall was about g=0.57 and recognition was about g=0.52.

Therefore, staying up late to study for two more hours does not necessarily mean that you have actually studied for two more hours, especially if you have to continue studying the next day.

5. Interleaving

Recommendation: ★★★★☆ Evidence: ★★★★☆

When learning three types of math problems, the traditional block method is to practice AAAAA, BBBBB, CCCCC continuously; interleaved learning involves mixed exercises in the order of A, B, C, A, C, B, etc. Its greatest value is not just to remember it more firmly, but to train learners to determine which method to use when seeing new problems.

A comprehensive analysis of 59 studies found that the overall effect of interleaved learning was approximately Hedges' g = 0.42. However, the effect is highly dependent on the material: it is especially effective for similar categories and problems that require discrimination strategies; for simple word memory, it may not be better than chunked learning.

• suitable task: Mathematics questions, programming, AWS architecture questions, medical diagnosis, similar concepts, similar syntax and similar cases
• Practice examples: Don’t just complete 50 Security Group questions in a row, you can mix Security Group, NACL, Route Table and IAM Policy practice
• subjective feeling: Staggered practice often feels harder, and this difficulty in discrimination is often its training value.

6. Elaborative Encoding

Recommendation: ★★★★☆ Evidence: ★★★★☆

The principle of fine processing is not to just remember "what", but also to ask "why". For example, after knowing that TCP uses a three-way handshake, continue to think about why three times is needed, what might happen twice, and whether four times are necessary. This allows new knowledge to form more connections with existing knowledge, and also adds more clues for future recall.

Fine-grained inquiry that keeps asking for reasons is one of the learning strategies that has been well supported by research in cognitive psychology.

7. Self-Explanation

After you have learned a topic, close the material and try to teach it to someone who knows nothing about it. For example, if you have just finished learning Private API Gateway, you can start by talking about how to access ordinary API Gateway, and then explain the differences of Private API Gateway. Wherever you can't go on, it usually means that you haven't really understood something yet.

Self-explanation exposes gaps in knowledge far better than saying, “I've read it three times.” A classic review of learning techniques rates it as a strategy with moderate evidence of practical value. The useful core of the Feynman Technique is the combination of retrieval, self-explanation, and elaborative learning.

8. The Memory Palace (Method of Loci)

Recommendation: ★★★★☆ Specific memory tasks: ★★★★★

The memory palace is one of the most mature methods of traditional mnemonics. First imagine a very familiar route, such as the doorway, shoe cabinet, sofa, TV, kitchen and refrigerator, and then turn the content that needs to be remembered into exaggerated images and place them in these fixed locations in turn.

To remember apples, elephants, airplanes, Einstein, and the sun, imagine a giant apple at the door, an elephant sitting on the shoe cabinet, a plane crashing into the sofa, Einstein walking out of the TV, and the sun appearing in the refrigerator. When recalling, walk along a familiar route, and the location will become a retrieval cue.

A 2025 systematic review and comprehensive analysis found that compared with ordinary retelling, memory palaces have greater advantages on adults' immediate sequence recall, with an effect of approximately d=0.88. However, the overall quality of the study was rated as low to very low, so it cannot simply be understood that everyone will get the same improvement.

• Particularly suitable for: Numbers, names, speeches, sequences, lists and exam knowledge points
• Usage restrictions: Not all complex knowledge is suitable for putting into the memory palace. Understanding and structuring are still irreplaceable.

9. Chunking

Recommendation: ★★★★☆

Chunking is one of the most basic memory techniques. For example, the number 193719451949 is difficult to remember directly, and it is much easier after it is broken into 1937, 1945, and 1949; the phone number 08012345678 can also be broken into 080, 1234, and 5678.

Its essence is to reduce the number of units that working memory needs to process simultaneously. When you first start learning AWS, VPC, Subnet, IGW, NAT, Route Table, NACL and SG are like seven independent projects; after you become proficient, they can be organized into a "VPC network architecture" knowledge block. Experts do not necessarily have ten times the working memory capacity of ordinary people, but a chunk of knowledge often contains more structured information.

10. Dual Coding

Recommendation: ★★★★☆

Dual coding combines words with images that express relationships. Rather than just memorizing the terms Internet, IGW, Route Table, Subnet, and EC2, it is better to draw the connections and hierarchical relationships from the Internet to EC2.

• Especially suitable for: Processes, networks, human structure, history, geography, biology and system architecture
• Common misunderstandings: Dual coding is not about piling pretty pictures into a presentation. The images must truly express the relationship between the information.

11. Connecting old and new knowledge

Recommendation: ★★★★☆

Long-term memory is more like a vast network of relationships than a collection of separate folders. Isolated new knowledge is hard to retrieve; the more connections it forms with prior knowledge, the more retrieval cues become available.

When learning AWS Direct Connect, don't stop at the definition. Compare it with a dedicated enterprise connection, a VPN, the public internet, Transit Gateway, and ways to connect multiple VPCs. Each relationship can become a retrieval cue later.

12. Use situations and examples to understand abstract concepts

Abstract definitions are often harder to remember than concrete situations. When learning about opportunity cost, instead of just memorizing "the value of the second-best option given up by choosing one option," it is better to set up a real scenario: you can get $1,480 from overtime work tonight, or you can go to a concert; if you choose the concert, the income you give up is part of the opportunity cost. Once the definition is connected to a specific situation, it will be much easier to understand and recall.

13. Exercise

Recommendation: ★★★★☆　Long-term brain health: ★★★★★　Immediate benefit for one study session: ★★★☆☆

Movement and active recall are not learning methods on the same level. Active recall directly affects memory encoding and retrieval, while exercise is more about improving the brain environment that supports cognitive activities.

A comprehensive analysis of single movements and long-term episodic memory in 2024 summarizes 42 experiments. When movement occurs before learning to encode, the effect is approximately d=0.23, which is a small effect size. Other comprehensive analyzes also found that exercising during the memory consolidation period after learning may have more obvious advantages, while exercising while encoding may slightly hinder episodic memory.

A more realistic arrangement is to maintain regular exercise and at the same time separate formal learning and exercise, without having to run and memorize at the same time.

14. Stay focused and reduce distractions

If information is not adequately encoded in the first place, subsequent memory techniques will be difficult to remedy. When watching AWS tutorials while processing LINE messages, TikTok, news, emails, and YouTube comments, the problem is often not poor memory, but that the content never really enters memory.

Attention precedes coding, which is the basis of all learning techniques. Turning off unnecessary notifications and reducing task switching during formal study is more effective than looking for memory shortcuts after distraction.

15. Provide timely corrective feedback

Active recall needs to be paired with corrective feedback. For example, when answering "Where is the capital of Japan?" you mistakenly answer Osaka. If there is no verification, the error may be further reinforced. The correct process is to answer first, check immediately, and then correct the error immediately. Studies of classroom testing have also shown that whether corrective feedback is provided affects the size of the testing effect.

16. Mnemonics

Mnemonics use artificial clues to preserve isolated information. Common practices include acronyms, rhymes, stories, and image associations.

• initials: Use HOMES to remember Huron, Ontario, Michigan, Erie, Superior Great Lakes
• rhyme: Use sound patterns to form additional clues
• story method: Linking cats, banks, apples, airplanes, and hospitals into "The cat robbed the bank, took the apple, took a plane, and ran away, and finally went to the hospital."
• image association: Convert abstract information into exaggerated, concrete, and easily distinguishable images

Such methods are useful for sequential and isolated items and are an essential tool for many memory contestants, but they are not a substitute for understanding complex concepts.

17. Remember after fully understanding

Understanding does not mean remembering, but understanding often makes remembering much easier. Memorizing only V=IR, but not knowing what V, I, and R stand for and how they change, the formula is easy to forget; after understanding the entire relationship, the content that requires mechanical memory will be greatly reduced.

The sequence of efficient learning is usually "understanding, structuring, and recalling" rather than continuous memorization. Comprehension provides structure, and active recall tests whether the structure can actually be retrieved.

18. Healthy diet

Eating a healthy diet is important for long-term brain health, cardiovascular health, and cognitive aging, but in a well-nourished, healthy adult, blueberries, walnuts, dark chocolate, or fish oil don't typically lead to a sudden 30% improvement in next-day memory.

• Avoid severe nutritional deficiencies and extreme diets
• Avoid long-term heavy intake of alcohol
• Pay attention to metabolic health and cardiovascular health

Diet is more like the foundation of learning and memory than an immediate memory plug-in.

19. Managing stress

Brief periods of stress sometimes strengthen certain memories, but long-term high stress can affect attention, sleep, working memory, and learning efficiency. Reducing long-term stress is essentially protecting the memory system. There's no need to aim for total stresslessness, though, and a moderate challenge usually doesn't cause problems.

20. Learning Environments and Retrieval Cues

When the test environment is similar to the learning environment, the same smell, location or background sometimes helps retrieval, which belongs to encoding specificity and context-dependent memory. This rule can also be used in reverse in actual learning, repeating learning in different environments such as home, coffee shop, company or library, creating more retrieval clues for the same knowledge, and reducing the situation that it can only be recalled by sitting in a fixed position.

Practical value ranking of mainstream methods

• No. 1: Active Recall — ★★★★★
• No. 2: Spaced Repetition — ★★★★★
• No. 3: Sleep — ★★★★★
• No. 4: Understanding and Fine Processing — ★★★★★
• No. 5: Self-Explanation — ★★★★½
• No. 6: Interleaved Learning — ★★★★½
• No. 7: Focus and reduce distractions — ★★★★½
• No. 8: Memory Palace and Association — ★★★★
• No. 9: Chunking — ★★★★
• No. 10: Images and Dual Encoding — ★★★★
• No. 11: Regular exercise — ★★★★
• No. 12: Stories, abbreviations, rhymes and other mnemonics — ★★★★
• No. 13: Healthy Eating — ★★★½
• No. 14: Stress Management — ★★★½

The first three are not suitable for simple comparison because they are responsible for different aspects. The complete system should sequentially complete concentration, understanding, active recall, spacing, active recall again, sleep consolidation and subsequent recall, and finally form long-term memory.

Methods That Feel Productive but Undermine Long-Term Memory

Rereading

Watching it 10 times in a row will create a strong sense of familiarity, but familiarity does not mean being able to recall it independently. The real test is whether you can get the point across without being prompted by the original text.

Excessive Highlighting

Covering a book in yellow highlights does not force the brain to retrieve information. A classic review of learning techniques rated highlighting and rereading substantially below practice testing and distributed practice.

Mindless Copying

When you are reading and copying a sentence, although your hands are working, your brain may not be recalling it. Notes are only more valuable when they are reorganized, compressed, or reconstructed from memory.

Cramming for Eight Hours in One Day

Cramming may help with an imminent exam, but it is usually much less effective for long-term memory than distributed study. Spread the same total time across several days and actively retrieve the material in every session for more durable learning.

A Practical, End-to-End Memory Routine

• Step 1 – 20 to 30 minutes to understand: Understand what knowledge is, why it is so, and how it relates to other knowledge
• Step 2 - Turn off data: Take a piece of white paper and write down what you just learned from memory.
• Step 3 - Open the data check: Find out the forgotten, misremembered and completely incompetent parts, and focus on reviewing only these knowledge gaps.
• Step 4 - Explain yourself: Use your own language to explain clearly why this knowledge works in this way, and relearn the parts that don’t make sense.
• Step 5 – Do mixed questions: Distinguish similar knowledge together and don’t do 10 identical questions in a row
• Step 6 – End of the day: No need to repeat endlessly, ensure normal sleep and consolidate memory.
• Step 7 - Review the next day: Don’t look at the notes first, just recall what you learned yesterday, and then check the answers
• Step 8 – Review Day 3: Take the initiative to recall again and correct mistakes promptly
• Step 9 — Review on Day 7: Retrieve the material again after a longer interval, focusing on anything that has become fuzzy
• Step 10 – Review Days 14 to 30: Actively recall again, and gradually transfer the content that can still be stably retrieved into a longer review cycle

Conclusion

These methods improve the efficiency of encoding, retaining and retrieving learned information, and do not turn the brain into a photographic memory machine. Rather than looking for a certain food, supplement, or shortcut to improve your memory, start by scheduling focus, understanding, active recall, timely feedback, spaced review, and sleep. For most learning tasks, this simple system is more reliable and easier to persist in the long term.