Improving Student Memory: Evidence-Based Strategies That
Explore evidence-based strategies from cognitive science to enhance student memory, including retrieval practice, spaced learning, and dual coding techniques.
How Can Teachers Improve Student Memory in the Classroom?
Teachers can improve student memory by implementing evidence-based strategies like retrieval practise, spaced repetition, and elaborative interrogation. Research shows students score 50% higher when using practise tests compared to re-reading or highlighting, partly due to the hypercorrection effect where confident wrong answers lead to stronger learning when corrected. The most effective approach combines these techniques with proper timing, such as scheduling review sessions when students are most alert.
Key Takeaways
- Retrieval practice is demonstrably superior to passive study for embedding learning: Encouraging pupils to recall information through practice tests or quizzes, rather than simply re-reading notes, substantially enhances long-term retention and understanding. Research by Roediger and Karpicke (2006) consistently shows that active retrieval strengthens memory traces and helps pupils identify knowledge gaps more effectively than re-reading.
- Optimising the timing and order of study sessions dramatically improves memory retention: Implementing spaced repetition, where learning is distributed over time, and interleaved practice, which mixes different topics or problem types, significantly boosts long-term recall and transfer of knowledge. Research consistently demonstrates that these strategies, when applied thoughtfully, lead to more robust learning outcomes for pupils compared to cramming (Dunlosky et al., 2013).
- Encouraging pupils to ask "why" questions significantly deepens understanding and memory retention: When pupils actively explain *why* a fact is true or *why* a concept works, they engage in elaborative interrogation, forging stronger connections in their memory. This metacognitive strategy, shown to be highly effective (Pressley et al., 1987), helps pupils integrate new information with existing knowledge, making it more retrievable.
- Strategic feedback, particularly after confident errors, can significantly enhance pupil learning: The hypercorrection effect demonstrates that when pupils are highly confident in a wrong answer and then receive corrective feedback, they are more likely to remember the correct information later. Teachers can leverage this by creating low-stakes testing environments where pupils feel safe to make mistakes, followed by immediate and clear correction, thereby strengthening memory (Butterfield & Metcalfe, 2001).
Retrieval practise and distributed practise (spacing) are very effective at improving long-term memory. Elaborative interrogation (asking ‘why?’ to help make connections) and interleaved practise (mixing up topics to revise rather than revising whole topics at a time) are fairly effective strategies. Highlighting, underlining and re-reading were not found to help improve long-t erm memory.
Use short quizzes to model spacing and interleaving. Teach students to use elaborative interrogation during revision.
What Is the Best Schedule for Spacing Study Sessions?
The optimal spacing schedule involves reviewing material at increasing intervals: after 1 day, then 3 days, then 1 week, and finally 2 weeks. This pattern combats the forgetting curve, where 42% of information is lost within 20 minutes without review. Morning review sessions are particularly effective due to higher alertness levels.
Cepeda et al (2008)
Spacing revision is more effective than cramming, especially if you need to remember the material for a long time. The gaps between revision should increase as students get closer to the exam. The researchers proposed the following spacing schedule for retaining new information from the day it is first encountered: 3 days, 8 days, 12 days, 27 days.
Plan retrieval practise of new material and put these into your planner at spaced intervals. Retrieval should roughly occur once in the following lesson, twice in the following week and once more two weeks later (four weeks after it was initially encountered).
How Do Spacing and Interleaving Work Together for Better Learning?
Spacing and interleaving work synergistically by combining time gaps between study sessions with mixed topic practise. Instead of studying one topic exhaustively, students alternate between different subjects or concepts within each spaced session. This combination has been shown to improve long-term retention and transfer of knowledge across contexts.
Rohrer and Taylor (2007)
Spacing out revision over a week rather than doing it in one sitting produced significantly higher test results. One week after the test, students who mixed different topics together (interleaving) during revision answered over three times more questions correctly than students who revised the material as one block at a time.
Educate students about the importance of spacing and interleaving for effective revision. Model these strategies when providing revision materials.
Why Does Music Reduce Test Performance During Revision?
Research shows that even instrumental music can reduce test scores by up to 33% compared to studying in silence. Music competes for cognitive resources needed for processing and encoding information, creating interference even when students feel more relaxed. Silent study environments consistently produce better memory retention and recall during exams.
Perham and Currie (2014)
Revising in silence produced the highest number of correct answers on a test. Revising while listening to music without lyrics produced the second highest number of correct answers. Students who listened to music with lyrics answered a third less of the questions correctly compared to the silent revision group. There was no difference between the test scores of students listening to music with lyrics that they liked and lyrics that they disliked.
Educate students about the impact that listening to music while revising has on subsequent exam performance.
What Makes Retrieval Practise More Effective Than Re-reading?
Retrieval practise forces students to actively recall information from memory, strengthening neural pathways more effectively than passive re-reading. Studies show this method produces 50% higher test scores because it reveals knowledge gaps and creates stronger memory traces. Students often prefer this harder method once they experience its superior results.
Students who had one study period followed by one session of retrieval practise scored at least 30% higher when tested than students who had two study periods of reading. Retrieval practise becomes more powerful when material needs to be remembered for longer periods of time and studying by reading becomes less effective. Students rated re-reading as a more effective method of revision but subsequently scored 50% more when using retrieval practise for revision. Students reported finding retrieval practise a more interesting form of revision.
Teach students about the effectiveness of retrieval practise compared to re-reading. Use retrieval practise as starters to strengthen ideas in the long-term memory.
How Does Asking 'Why' Questions Improve Memory Retention?
Elaborative interrogation through 'why' questions helps students create meaningful connections between new information and existing knowledge. This strategy transforms surface-level memorization into deeper understanding by forcing students to explain relationships and causation. The technique is particularly effective for conceptual learning across all subject areas.
Pressley et al (1987)
Students remembered twice as many facts presented as sentences when they were asked a ‘why’ question relating to each sentence compared to hearing the sentences alone or hearing the sentences with an explanation.
Use elaborative interrogation (asking ‘why’) when presenting students with new facts and encourage them to use this technique themselves during revision.
When Should Students Read Material Out Loud for Better Memory?
Reading out loud is most effective for memorizing specific facts, vocabulary, or formulas that require exact recall. The dual encoding of both speaking and hearing the information creates multiple memory pathways. This technique works best in short bursts of 10-15 minutes to maintain focus and prevent fatigue.
Forrin and MacLeod (2018)
The researchers compared the effectiveness of learning key terms when reading them in silence, reading them out loud, listening to a recording of yourself reading them and listening to someone else read them to you. The greatest difference in performance was between reading the words out loud and reading the words in silence. Reading out loud led to a 12% increase in performance.
If students are planning to read a list of key words to commit them to memory, encourage them to read them out loud rather than in silence. Ideally, this should be followed up by retrieval practise to improve retention.
How Do Visual and Verbal Information Work Together in Memory?
Combining pictures with words creates dual coding that significantly enhances memory retention compared to text alone. The brain processes visual and verbal information through separate channels, creating multiple retrieval routes. This technique is especially powerful for complex concepts that benefit from visual representation.
Mayer et al (1991)
When students studied using pictures and words they were better able to apply their knowledge to different problems, situations and questions than when they studied using words alone. Verbal recall of facts was not affected by the presence of pictures. Studying using pictures and words led to a 50% increase in correct answers when compared to studying words followed by pictures and just studying pictures.
Use a combination of pictures and words when delivering new material and encourage students to use this technique during revision.
Teaching Others
Nestojko et al (2014)
Students performed better on a test when they were told they would be asked to teach the material to someone else compared to those who were told to prepare for a test. Those who expected to teach someone were better able to answer questions and remember key facts.
Suggest students teach a topic to someone else when they are revising or tell the class to prepare to teach someone else in the following lesson and select someone at random to do it.
What Is the Forgetting Curve and How Fast Do Students Forget?
The forgetting curve shows that students lose 42% of new information within just 20 minutes without review, and up to 70% within 24 hours. This rapid memory decay continues unless interrupted by strategic review sessions. Understanding this pattern helps teachers time reviews and homework assignments for maximum retention.
Murre and Dros (2015)
Ebbinghaus (1880) created a forgetting curve based on studies, which showed how much new information is forgotten during the first 31 days after learning. Murre and Dros (2015) replicated these findings, showing that approximately 42% of learnt material is forgotten after just 20 minutes. However, they found that memory is better in the morning following learning than it is in the evening of the day the material was learnt (showing a boost in memory overnight). They found support for the primacy and recency effects (the first and last thing learnt are remembered more than those in the middle).
Think of the forgetting curve as a guide but be aware that reality is likely to be more complex. When presenting a list of key terms to learn, put the most challenging or important at the start and end of the list. Suggest that students do retrieval practise in the morning following a revision session the previous day.
How Do Pre-Questions Before Teaching Improve Learning?
Presenting questions before teaching new content primes students' brains to actively seek relevant information during the lesson. This technique increases attention, engagement, and retention by creating a mental framework for organising incoming information. Pre-questions are effective across all subjects and can improve recall by up to 40%.
Carpenter and Toftness (2017)
Students performed better on a test when they had been asked questions about a topic immediately before being taught it (pre-questioning). Their performance on test questions was improved when the topic matched the pre-question topic and when the topic did not match the pre-question topic compared to the performance of a group of students who were not given any pre-questions.
Consider using pre-questions immediately before starting a new topic or delivering new information.
Reducing Student Stress During Retrieval Practise
Teachers can minimise retrieval practise stress by starting with low-stakes quizzes and providing immediate, constructive feedback. Creating a supportive environment where mistakes are viewed as learning opportunities helps students embrace the challenge. Gradually increasing difficulty while maintaining regular practise builds both competence and confidence.
Smith et al (2016)
Researchers compared the effectiveness of re-reading and retrieval practise when revising for tests completed in stressful and non-stressful environments. Students using retrieval practise outperformed students using re-reading in all conditions, including retrieval practise in a stressful environment compared to re-reading in a non-stressful environment. Students who used re-reading for revision suffered the most during stressful situations whereas students using retrieval practise were not negatively affected by stress.
Convey to students ‘don’t study in order to do well at a test. Do lots of tests in order to study well.’ Help students to develop the habit of using retrieval practise for revision.
Best Evidence-Based Memory Strategies Summary
The top research-backed strategies are retrieval practise (50% improvement over re-reading), spaced repetition, elaborative interrogation, and avoiding music during study. Morning study sessions maximise retention due to higher alertness, while combining visual and verbal information enhances encoding. These techniques work best when implemented consistently across all subjects with proper teacher guidance.
Retrieval practise: any activity where students have to generate answers.
Spacing: revisiting topics little and often.
Interleaving: vary and mix up the topics and style of questions being asked.
Pre-Questioning: ask questions about a new topic before starting to teach it.
Elaborative Interrogation: ask 'why would that be the case?'
Dual Coding: combine pictures and words.
Avoid Distractions: discourage students from listening to music or having mobile phones visible.
Teach Someone Else: this leads to a deeper understanding and organisation in the long-term memory.
Frequently Asked Questions
What is retrieval practise and why is it more effective than re-reading or highlighting?
Retrieval practise involves actively recalling information from memory rather than passively reviewing materials. Research shows students score 50% higher using practise tests compared to re-reading or highlighting because it strengthens neural pathways and reveals knowledge gaps that need attention.
How should teachers schedule spaced review sessions for maximum effectiveness?
The optimal spacing schedule involves reviewing material at 3 days, 8 days, 12 days, and 27 days after initial learning. Morning review sessions are particularly effective due to higher alertness levels, and this pattern combats the forgetting curve where 42% of information is lost within 20 minutes without review.
What is interleaved practise and how does it differ from traditional blocked studying?
Interleaved practise involves mixing different topics or problem types during study sessions rather than studying one topic completely before moving to another. Students who used interleaving answered over three times more questions correctly one week after testing compared to those who revised materials in blocks.
Why should students avoid listening to music whilst revising, even instrumental music?
Even instrumental music can reduce test scores by up to 33% compared to studying in silence because it competes for cognitive resources needed for processing information. Silent study environments consistently produce better memory retention and recall during exams, making this a crucial revision guideline for students.
How can teachers implement elaborative interrogation in their lessons?
Teachers can use elaborative interrogation by encouraging students to ask 'why' questions that help create meaningful connections between new information and existing knowledge. This transforms surface-level memorisation into deeper understanding and significantly improves long-term retention across all subjects.
What are the biggest mistakes students make when revising, according to this research?
Students commonly prefer re-reading despite its lower effectiveness, engage in cramming instead of spacing out study sessions, and listen to music during revision. They also tend to study one topic completely before moving on rather than interleaving different topics, which significantly reduces their learning effectiveness.
Essential Memory Research Studies
These peer-reviewed studies provide the research foundation for the strategies discussed here:
A systematic review of the impact of artificial intelligence on educational outcomes in health professions education
46 citations
This review examines how AI tools affect learning outcomes in medical and health education settings. While not directly about memory strategies, it provides teachers with evidence about emerging technologies that may enhance student learningand assessment in professional training contexts.
Measuring effectiveness of augmented reality‐based geometry learning assistant on memory retention abilities of the students in 3D geometry
45 citations
S. Gargrish et al. (2021)
This study demonstrates that augmented reality can significantly improve students' memory retention when learning complex 3D geometry concepts. Teachers can use this evidence to advocate for AR tools that make abstract mathematical concepts more concrete and memorable, especially for students who struggle with traditional textbook approaches.
The Educational Efficacy of Humane Teaching Methods: A Systematic Review of the Evidence
34 citations
Miriam A. Zemanova & A. Knight (2021)
This review shows that humane alternatives to animal use in science education are equally or more effective for student learning. Teachers in life sciences can confidently adopt ethical teaching methods knowing they support strong memory retention and skill development without compromising educational quality.
Science of Learning Strategy Series: Article 1, Distributed Practise.
18 citations
T. V. van Hoof et al. (2020)
This article explains how spacing out practise over time, rather than cramming, helps students achieve better mastery and long-term memory retention. Teachers can apply this evidence-based strategy by designing lesson plans and review schedules that revisit material multiple times across days or weeks instead of concentrating all practise in single sessions.
Distributed Practise or Spacing Effect
14 citations
Shana K. Carpenter (2020)
This paper provides theoretical explanations for why spaced learning produces better memory than massed practise, including how the brain processes information more effectively when given time between learning sessions. Understanding these cognitive mechanisms helps teachers design more effective study schedules and explain to students why distributed practise improves their exam performance and retention.
Essential Memory Research Studies
These peer-reviewed studies provide the research foundation for the strategies discussed below:
Academic and Wellness Outcomes Associated with use of Anki Spaced Repetition Software in Medical School View study ↗
19 citations
Jillian K Wothe et al. (2023)
This study examines how medical students use Anki, a digital flashcard app based on spaced repetition principles, and its impact on their academic performance and well-being. Teachers can learn from this research about how students are independently using technology to enhance memory retention, and consider whether similar spaced repetition tools might benefit their own classrooms for helping students review and retain course material over time.
Single-paper meta-analyses of the effects of spaced retrieval practise in nine introductory STEM courses: is the glass half full or half empty? View study ↗
10 citations
Immediate Versus Delayed Low-Stakes Questioning: Encouraging the Testing Effect Through Embedded Video Questions to Support Students’ Knowledge Outcomes, Self-Regulation, and Critical Thinking View study ↗
6 citations
Joseph T. Wong et al. (2024)
This study compares the effectiveness of asking questions immediately during educational videos versus delaying questions until later, examining how timing affects student learning and thinking skills. Teachers using video-based instruction can apply these findings to decide when to insert quiz questions or discussion prompts to maximise student retention, self-regulation, and deeper understanding of the material.
Engagement and learning in an electronic spaced repetition curriculum companion for a paediatrics academic half-day curriculum View study ↗
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Addressing vaccine hesitancy: A systematic review comparing the efficacy of motivational versus educational interventions on vaccination uptake View study ↗
4 citations
This review compares traditional educational approaches with motivational interviewing techniques for changing health behaviours, finding that simply providing information is often insufficient for behaviour change. Teachers can apply this insight beyond health topics, recognising that helping students understand why something matters personally and building their motivation may be more effective than simply presenting facts, especially when teaching topics that require attitude or behaviour changes.
How Spaced Repetition and Interleaving Boost Long-Term Memory Retention
When students revise material once and never return to it, they lose up to 80% of what they've learnt within a month. Spaced repetition combats this natural forgetting process by strategically revisiting content at increasing intervals. Rather than cramming information in one session, teachers can structure learning across days, weeks, and months to strengthen neural pathways and improve recall.
Research by Cepeda and colleagues (2006) demonstrates that spacing study sessions produces retention rates twice as high as massed practise. In practical terms, this means introducing key concepts on Monday, briefly reviewing them on Wednesday, then conducting a more thorough revision the following week. For instance, after teaching photosynthesis, a biology teacher might include quick starter questions about it three days later, then incorporate it into a quiz after a fortnight, and finally revisit it through an application task after a month.
Interleaving takes this further by mixing different topics within study sessions rather than blocking them separately. Instead of spending an entire lesson on fractions, then another on decimals, a maths teacher might alternate between problem types. This approach, though initially more challenging for students, improves their ability to identify which strategy to apply in different contexts; a crucial skill for examinations.
To implement these techniques effectively, consider creating a revision timetable that revisits topics at specific intervals: 1 day, 3 days, 1 week, 2 weeks, and 1 month after initial teaching. During revision sessions, mix question types from different units rather than reviewing topics in isolation. This approach may feel less comfortable for students initially, but the long-term benefits for memory retention and application skills are substantial.
Why Retrieval Practise Outperforms Re-reading for Memory Enhancement
Despite students' natural preference for re-reading their notes, research consistently demonstrates that retrieval practise produces significantly better learning outcomes. When students actively recall information from memory, rather than passively reviewing it, they strengthen neural pathways and create more durable memories. This counterintuitive finding challenges traditional revision methods and offers teachers a powerful tool for improving student achievement.
The effectiveness of retrieval practise stems from what cognitive scientists call the "testing effect". Each time students successfully retrieve information, they reinforce memory traces and make future recall easier. Even unsuccessful retrieval attempts prove valuable; the effort required to search memory, combined with subsequent feedback, creates stronger encoding than passive review. Studies by Roediger and Karpicke (2006) found that students who used practise testing retained 50% more information after one week compared to those who simply re-read materials.
Teachers can implement retrieval practise through several straightforward methods. Start lessons with quick recall activities, such as asking students to write down everything they remember from the previous lesson without looking at their notes. Use regular low-stakes quizzes that focus on essential content from recent and past topics. Another effective approach involves paired retrieval, where students take turns quizzing each other using flashcards or prepared questions.
The key to successful implementation lies in framing these activities as learning opportunities rather than assessments. Explain to students that the struggle to remember is actually strengthening their memory, not revealing weakness. By making retrieval practise a regular classroom routine, teachers can help students develop more effective study habits whilst significantly improving long-term retention of subject knowledge.
Understanding Working Memory: The Foundation of Student Learning
Working memory acts as the brain's mental workspace, where students actively process and manipulate information during learning. Unlike long-term memory, working memory has severe limitations; most students can only hold 3-5 pieces of information simultaneously. This constraint directly affects how much new content students can absorb in a single lesson.
Research by Baddeley and Hitch reveals that working memory consists of multiple components: the phonological loop (processing sounds and words), the visuospatial sketchpad (handling images and spatial information), and the central executive (coordinating everything). When teachers overload any component, learning breaks down. For instance, presenting complex diagrams whilst speaking rapidly can overwhelm both the visual and auditory channels, causing students to miss crucial information.
Practical strategies to support working memory include chunking information into smaller units. Rath er than teaching all 12 tenses at once, introduce three related tenses per lesson. Another effective approach involves reducing extraneous cognitive load; instead of decorating slides with unnecessary images, use clear visuals that directly support the content. Teachers should also provide worked examples before independent practise, as novice learners' working memory becomes quickly overwhelmed when solving problems from scratch.
The link between working memory and long-term learning is crucial. Information must pass through working memory before it can be stored permanently. By respecting working memory limitations through careful lesson design, teachers create conditions where knowledge transfers successfully to long-term storage. This understanding transforms how we approach instruction, moving from information delivery to cognitive load management.
