You've probably heard "study smarter, not harder" so many times it's stopped meaning anything. Let's fix that. Here's what cognitive science actually says about learning efficiently — and why most students ignore it.
Re-reading and highlighting can create familiarity, but they are usually more useful when combined with retrieval, explanation, or practice. Their value depends on the task and how they are used.
A landmark 2013 review by Dunlosky et al. in Psychological Science in the Public Interest rated ten common study techniques by their evidence base. Re-reading and highlighting ranked low utility — they create a feeling of fluency (you recognise the material) without building actual recall.
The problem is that recognition and recall are different cognitive processes. Exams test recall. Re-reading trains recognition.
Testing yourself is one of the better-supported study techniques, but no single technique is best for every task or student.
When you pull information out of memory, you strengthen the neural pathway. When you re-read, you're just re-exposing the pathway without activating it.
How to do it: After reading a section, close the book and write everything you can remember. Use flashcards. Do past papers. Explain the topic to someone else. The difficulty is the point.
The forgetting curve describes how recall can decline without review, but the amount and timing vary widely with the material, prior knowledge, and learner. Avoid treating a single percentage as a universal rule.
Spacing reviews over time can support longer-term recall, but the useful intervals depend on the material and learner.
Apps like Anki implement this algorithmically. DeDuckt's quiz feature within lessons serves a similar purpose for the specific content you're studying.
Most students study one topic until they feel they've mastered it, then move to the next (blocked practice). Interleaving mixes topics within a single study session.
Interleaving can feel harder during practice and may improve performance on some later tests, but results depend on the subject and how the practice is designed.
Ask "why" and "how" constantly. Don't accept a fact — demand to know why it's true, how it connects to what you already know, what would change if it were different.
This can help integrate new information with existing knowledge and may make it easier to retrieve later.
Based on the above, a high-yield study session looks like this:
Total: ~60 minutes. After this, take a break. The brain consolidates during rest.
Study formats can help with specific tasks, but no format is a guaranteed match for a person. Choose based on the chapter, your goal, and whether you can retrieve or apply the material.
Choosing a format that suits the material and task may make study more manageable, but it does not guarantee a cognitive or performance benefit.
That's the premise behind DeDuckt: take a chapter, choose a format, then apply effective study techniques such as retrieval and spacing on top of that material.
| Technique | Evidence Level | How to Use |
|---|---|---|
| Retrieval practice | High | Self-testing, past papers, explain-it-back |
| Spaced repetition | High | Review material across increasing intervals |
| Interleaving | Moderate | Mix topics within sessions |
| Elaborative interrogation | Moderate | Ask why/how for every new fact |
| Re-reading | Low | Avoid as primary strategy |
| Highlighting | Low | Avoid as primary strategy |
Study methods matter, but performance also depends on prior knowledge, time, instruction, practice quality, and the subject. A better method is useful only when it is actually applied consistently.
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