The study method you are using right now may have been scientifically proven to be ineffective. Highlighting text, re-reading passages, rewriting notes -- these are methods used by over 90% of students, yet a large-scale study by Dunlosky et al. in 2013 rated them as "no benefit" to "low benefit." If your efforts are not paying off, it is not an ability problem. It is a method problem.
Research in cognitive psychology has revealed that the majority of study methods people believe to be effective are actually inefficient. On the other hand, the methods with strong scientific evidence are remarkably simple.
In this article, we introduce five study methods whose effectiveness has been repeatedly confirmed in peer-reviewed papers in psychology and cognitive science. All of them can be put into practice starting today, and you may notice results in as little as one week.
First, Know This -- Why Your "Usual Study Routine" Is Inefficient
In a large-scale review study published by Dunlosky et al. in 2013, the effectiveness of the most commonly used study methods was scientifically evaluated. The results were striking:
| Study Method | Usage Rate | Scientific Rating |
|---|---|---|
| Highlighting / Underlining | Very high | No benefit |
| Re-reading text | Very high | Low benefit |
| Rewriting / Summarizing notes | High | Low benefit |
| Practice testing (self-quizzing) | Low | Very high benefit |
| Spaced review | Low | Very high benefit |
In short, most people rely heavily on "low-benefit methods" while rarely using "high-benefit methods." This simply means the direction of effort is wrong -- by switching to the right methods, the same amount of effort can produce dramatically different results.
1. Active Recall -- The Act of Remembering Itself Strengthens Memory
Consistently supported across all cognitive science research as the most effective study method is active recall.
Instead of "reading" a textbook, close the book and "recall" the content. Instead of "reviewing" your notes, write out what you remember on a blank sheet. The act of "trying to remember" itself strengthens the brain's memory circuits.
Why It Works
In a 2006 experiment by Roediger & Karpicke, a group that read the same passage twice was compared with a group that read it once and then took a recall test.
| Group | Score After 5 Minutes | Score After 1 Week |
|---|---|---|
| Read twice | 81% | 42% |
| Read + Test | 75% | 56% |
While scores were nearly identical after 5 minutes, a 14-point gap emerged after one week. This means that recalling information in a test format is overwhelmingly superior for forming long-term memory.
Practical Tips You Can Start Today
- After reading one section of a textbook, close the book and write out the content on a blank sheet of paper
- After a class, write down three key points without looking at your notes
- Use flashcards to test yourself -- this is the easiest and most effective method
Flashcards are the ideal tool for practicing active recall. The repeated act of seeing a "question" and recalling the "answer" strengthens your brain's memory pathways.
2. Spaced Repetition -- "The Moment Before You Forget" Is the Golden Window for Memory
The second scientifically proven study method is spaced repetition. Reviewing the same material once a day over five days is far more effective for retention than reviewing it five times in a single day.
What the Forgetting Curve Teaches Us
According to the forgetting curve discovered by Ebbinghaus, memory fades rapidly from the moment of learning. However, if you review just before the memory disappears, the time until the next forgetting event is significantly extended.
- 1st review: after 1 day -- time to forgetting extends to 3 days
- 2nd review: after 3 days -- time to forgetting extends to 1 week
- 3rd review: after 1 week -- time to forgetting extends to 3 weeks
- 4th review: after 3 weeks -- time to forgetting extends to 2 months
Through this mechanism of "gradually expanding intervals," virtually permanent long-term memories are eventually formed.
The Biggest Challenge -- Deciding "When to Review"
The effectiveness of spaced repetition is clear, but the practical barrier is managing review timing. You can manually manage 10 items, but optimally scheduling reviews for 1,000 or 10,000 pieces of knowledge is beyond human capability.
This is where AI changes everything. Memly's FSRS 6.0 algorithm learns your memory patterns and calculates the forgetting probability for each card in real time, automatically presenting "the cards you should review today" in the optimal order. To understand how AI enhances spaced repetition, read How AI Flashcard Apps Work.
3. Interleaving -- Mixing Topics Builds Real-World Application Skills
The third method is interleaving. Rather than solving the same type of problem consecutively ("blocked practice"), you mix different types of problems and solve them in random order.
Surprising Experimental Results
In a study by Rohrer & Taylor (2007), a group that practiced math problems in blocked format was compared with a group that used interleaving.
| Study Method | Accuracy During Practice | Test Score After 1 Week |
|---|---|---|
| Blocked practice (same type consecutively) | 89% | 20% |
| Interleaving (mixed) | 64% | 63% |
Notice that during practice, the blocked group performed better. This leads learners to mistakenly believe that blocked practice is more effective. However, on the test one week later, the interleaving group scored more than 3 times higher.
The feeling of "doing well" during practice does not necessarily indicate greater learning effectiveness. In cognitive science, this is known as the "illusion of fluency."
Practical Tips
- For language learning, alternate between grammar, vocabulary, and listening in 30-minute blocks
- For math, randomly mix problems from calculus, integration, and probability
- For certification exams, review flashcards from different subjects in a mixed order
Memly includes a feature that mixes cards from different decks, enabling you to practice interleaving naturally.
4. Elaboration -- Simply Asking "Why?" Can Double Your Memory
The fourth method is elaborative interrogation. After learning new information, you ask yourself "Why is this the case?" and "How does this connect to what I already know?"
Why It Works
Connecting new information to your existing knowledge network increases the number of "access points" to that memory. Isolated knowledge is easily forgotten, but knowledge linked to other concepts can be accessed from multiple directions, making it much harder to forget.
In a study by Pressley et al. (1987), a group that memorized facts as-is was compared with a group that thought about "why" each fact was true. The group that used elaboration had a retention rate approximately twice as high as the other group.
Synergy with Flashcards
The process of creating flashcards is itself an act of elaboration. Thinking about "how to frame this as a question" and "how to organize the answer" naturally leads to structuring and connecting information.
- Add a sentence explaining "why this is the case" to the answer side of cards
- Create cards that ask about differences between similar concepts
- Link cards containing specific examples to abstract principles
5. Dual Coding -- Encoding with Both Words and Visuals
The fifth method is dual coding. When the same content is processed through both verbal and visual information, memory retention improves significantly.
Paivio's Dual Coding Theory
According to this theory proposed by Allan Paivio in 1971, the brain processes language and visuals through separate channels. Information encoded through both channels is far easier to recall than information encoded through just one.
- Reading text only -- processed through 1 channel
- Text + diagrams or images -- processed through 2 channels -- memory is strengthened
How to Practice It
- Draw diagrams and arrows in your notes as you study
- After learning a concept, try sketching a simple diagram that represents it
- Include images in your flashcards -- Memly supports automatic generation of image-based cards
What Happens When You Combine All Five Methods
Each of the five methods introduced above is effective on its own, but they deliver maximum impact when combined.
| Method | Standalone Effect | When Combined |
|---|---|---|
| Active Recall | Memory strengthening | Achieved through the Q&A format of flashcards |
| Spaced Repetition | Long-term retention | AI automatically calculates optimal timing |
| Interleaving | Improved application skills | Mixed presentation of cards from different decks |
| Elaboration | Deeper understanding | Naturally occurs during card creation |
| Dual Coding | Multi-channel memory | Visual + verbal through image-based cards |
Trying to practice all five principles simultaneously by hand makes management extremely complex. Calculating review timing, mixing card order, and adjusting difficulty across thousands of cards is simply not realistic.
Memly has integrated these scientific study methods into a single app.
- AI automatically generates flashcards from PDFs, images, and videos -- instantly preparing materials for active recall
- The FSRS 6.0 algorithm automatically optimizes review timing -- fully automating spaced repetition
- Cards from different decks are mixed during presentation -- enabling natural interleaving practice
- The process of creating and editing cards structures information -- elaboration happens automatically
- Image-based card generation is supported -- making dual coding easy to achieve
"Only Those Who Know the Right Method Get Ahead"
As the Dunlosky study cited at the beginning shows, most people spend their time on low-effectiveness study methods. But having read this far, you now know "the right methods."
The problem is that knowing alone is not enough. Without taking action, tomorrow you will simply repeat the same inefficient studying.
Most people who read this article will think "Interesting, I'll try it sometime" and then change nothing. But only those who actually take action will see different results. With Memly, you can naturally practice all five scientific study methods without even thinking about them. Account creation takes 30 seconds and requires no credit card. Start by picking just one topic today and creating some cards. Even 15 minutes of study will surprise you a week later when you realize how much you still remember.
For a comprehensive overview of AI-powered memorization support, see our article "What Is AI-Powered Memorization Support? A Complete Guide to How It Works, Its Effectiveness, and the Best Tools." For help picking the right tool to put these methods into practice, see our AI flashcard app guide.