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.
Improving Learner Memory: Evidence-Based Strategies That explains how teachers can help learners build memory over time. It focuses on how learners encode, store, retrieve and apply knowledge through retrieval practice, spaced review, interleaving, feedback and metacognitive monitoring. Roediger and Karpicke (2006) showed that practice testing can improve delayed recall when compared with re-reading.
In a Year 8 science lesson, this means asking learners to recall photosynthesis from memory. They explain why light affects glucose production, correct misconceptions, and revisit the idea next week in a new context. The aim is durable understanding: recall linked to schema, classroom talk and independent judgement, including the ability to question AI-generated answers.
Improving Learner Memory in the Classroom
Use retrieval practice and spaced repetition to help learners remember more, while teaching learners to plan, monitor and check their thinking as Brown (1987) described. Practise tests can raise scores by around 50% (Roediger and Karpicke, 2006), a finding popularised by Brown, Roediger and McDaniel (2014) in Make It Stick. Correcting wrong answers learners are sure about makes learning stronger. Time reviews when learners are most alert.
Key Takeaways
- Retrieval practice is demonstrably superior to passive study for embedding learning: Encouraging learners 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 learners 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 learners compared to cramming (Dunlosky et al., 2013).
- Encouraging learners to ask "why" questions significantly deepens understanding and memory retention: When learners 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 learners integrate new information with existing knowledge, making it more retrievable.
- Strategic feedback, particularly after confident errors, can significantly enhance learner learning: The hypercorrection effect demonstrates that when learners are highly confident in a wrong answer and then receive corrective feedback, they are more likely to remember the correct information later. Teachers can use this by creating low-stakes testing environments where learners feel safe to make mistakes, followed by immediate and clear correction, thereby strengthening memory (Butterfield & Metcalfe, 2001).
Retrieval practice and spaced practice help memory well. Elaborative interrogation, which means asking why, and interleaved practise can also help. Highlighting, underlining, and rereading did not improve long-term memory (Dunlosky et al., 2013).
Spaced quizzes work, says Dunlosky et al. (2013). Elaborative interrogation also helps learners revise, according to Weinstein et al. (2018). Model these techniques in class to boost recall.
Spacing Study Sessions
A useful spacing schedule revisits material after 1 day, 3 days, 1 week and 2 weeks, then returns again before assessment. This pattern responds to the forgetting curve by giving learners repeated chances to retrieve knowledge before it fades. Treat the timings as a guide: attendance, topic difficulty and classroom disruption all affect when review is needed.
Cepeda et al (2008)
Spacing revision is more effective than cramming, especially when learners need to remember material for months rather than days. Cepeda et al. (2008) proposed 3, 8, 12 and 27 day intervals, but teachers should treat this as a planning guide, not a rigid timetable. In a school with irregular attendance, every sequence needs a fault-tolerant memory routine: recap the last lesson, last week and last unit in short starters so absent learners meet the same core ideas more than once.
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).
Spacing and Interleaving Together
Spacing and interleaving combine gaps with mixed practice. Learners switch topics during spaced study sessions. This helps knowledge stick long term and move between subjects (Rohrer & Pashler, 2010). Use it as a starting point for professional discussion: identify the learner's current need, record evidence from more than one lesson, and agree the next classroom adjustment with the SENCO or family.
Rohrer and Taylor (2007)
Spacing revision across a week led to significantly higher test results than doing it all in one sitting. One week after the test, learners who mixed different topics during revision used interleaving. They answered over three times more questions correctly than learners who revised the material one block at a time.
Spacing and interleaving help learners revise well, according to research (Rohrer & Pashler, 2007; Dunlosky et al., 2013). Show learners how to use these strategies when you give them revision resources.
Why Does Music Reduce Test Performance During Revision?
Instrumental music may lower test scores by 33% (Perham and Currie, 2014). Music uses a learner's cognitive resources, which can get in the way of thinking. Research shows that silent study improves memory and recall (Campbell and Schellenberg, 2010).
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. Learners 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 learners listening to music with lyrics that they liked and lyrics that they disliked.
Retrieval Practice and Re-reading
Retrieval practice asks learners to generate an answer before seeing it again. This helps because recall exposes gaps, creates a reason to attend to feedback, and strengthens later access to the knowledge (Roediger & Karpicke, 2006). It works best when the answer is then explained, corrected and linked to a wider schema.
Learners who had one study period followed by one session of retrieval practice scored at least 30% higher when tested than learners who had two study periods of reading. Retrieval practice becomes more powerful when material needs to be remembered for longer periods of time and studying by reading becomes less effective. Learners rated re-reading as a more effective method of revision but subsequently scored 50% more when using retrieval practice for revision. Learners reported finding retrieval practice a more interesting form of revision.
Teach learners that retrieval practise works better than re-reading. Use retrieval practise as starters to help ideas stick in long-term memory.
How Does Asking 'Why' Questions Improve Memory Retention?
Elaborative interrogation means asking 'why' questions. It links new ideas to what learners already know. This helps learners explain causes and links, not just memorise facts. Woloshyn et al (1990) and Ozgungor and Demircioglu (2017) found it improves subject understanding.
Pressley et al (1987)
Learners 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.
Research suggests this method improves learning. Elaborative interrogation means asking "why" to help learners understand new facts. (Pressley, 1992; Woloshyn et al., 1990). Encourage learners to use this active recall technique during revision.
Reading Aloud for Exact Recall
Reading out loud is most effective for memorising 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 learners 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?
Learners remember better when pictures join words; it's dual coding. Paivio (1971, 1986) showed visuals and text use different brain routes, aiding recall. Mayer (2009) found this is useful for understanding complex ideas.
Mayer et al (1991)
When learners 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.
Dual coding, using pictures with words, helps learners grasp new ideas. Present new information this way and ask learners to revise using it (Paivio, 1971). This method builds stronger recall, according to research by Sadoski and Paivio (2001).
Teaching Others
Nestojko et al (2014)
Learners 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 learners 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 Learners Forget?
The forgetting curve shows how quickly learners forget new learning without review. They lose 42% of new information within 20 minutes, and up to 70% within 24 hours. This fast memory decay continues unless teachers plan review sessions. Knowing this pattern helps teachers time reviews and homework for better retention.
Murre and Dros (2015)
Ebbinghaus (1880) created the forgetting curve to show how recall changes across the first 31 days after learning. Murre and Dros (2015) replicated this pattern and reported that about 42% of learnt material was forgotten after 20 minutes.
The same replication found stronger recall on the morning after learning than on the evening of the learning day. This suggests an overnight memory benefit. It also supported primacy and recency effects: learners remembered the first and last items better 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 learners do retrieval practise in the morning following a revision session the previous day.
How Do Pre-Questions Before Teaching Improve Learning?
Researchers found that questions before lessons help learners seek information. This boosts focus, involvement, and memory. Pre-questions work across subjects and can improve recall. Learners may remember up to 40% more.
Carpenter and Toftness (2017)
Learners 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 learners who were not given any pre-questions.
Try using pre-questions just before starting a new topic or sharing new information.
Reducing Retrieval Stress
Low-stakes quizzes and prompt feedback can reduce retrieval stress, but low stakes must be visible to learners. Avoid public speed rounds as the default, especially for anxious or neurodivergent learners. Use private whiteboards, think time and optional rehearsal before cold recall. Mistakes should lead to feedback and re-teaching, not ranking (Agarwal et al., 2012; Roediger & Karpicke, 2006).
Smith et al (2016)
Retrieval practice beat re-reading for test revision (Smith et al., 2016). Learners did better with retrieval, even when stressed. Stress hurt learners who revised by re-reading. Retrieval practice helped learners handle stress.
Convey to learners ‘don’t study in order to do well at a test. Do lots of tests in order to study well.’ Help learners to develop the habit of using retrieval practise for revision.
Best Evidence-Based Memory Strategies Summary
Retrieval practice, spaced review, elaborative interrogation and dual coding all help memory. The aim is not for learners to store every fact on its own. In the LLM era, learners also need secure schemas: clear frameworks that help them judge whether an AI answer is plausible, incomplete or misleading (Kasneci et al., 2023). Teachers should use memory routines to strengthen core vocabulary, causal models and worked examples across subjects.
Retrieval practice: any activity where learners 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: ask learners not to listen to music while they work. Keep mobile phones out of sight too.
Teach Someone Else: this helps learners understand ideas more deeply. It also helps them organise knowledge in the long-term memory.
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- Learners retrieve, connect and explain key ideas.
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Frequently Asked Questions
What is retrieval practice and why is it more effective than re-reading or highlighting?
(Karpicke & Blunt, 2011). Retrieval practice helps memory by making learners use active recall. Learners score 50% higher on tests when they use practice tests.
This works better than re-reading or highlighting (Karpicke & Blunt, 2011). Practice strengthens learning (Roediger & Butler, 2011). It also shows where learners need extra support (Agarwal et al., 2012).
How should teachers schedule spaced review sessions for maximum effectiveness?
Spacing reviews at 3, 8, 12, and 27 days works best after learners first study something. Morning revision helps learners remember more because they are more alert. Without review, learners forget 42% within 20 minutes (Ebbinghaus, 1885).
What is interleaved practise and how does it differ from traditional blocked studying?
Interleaved practice means mixing topics during study. This helps learners compare ideas and choose the right method. Learners who used interleaving answered more questions correctly, with benefits persisting a week after testing (Rohrer & Taylor, 2007).
Why should learners avoid listening to music whilst revising, even instrumental music?
Instrumental music reduces test scores by 33% (Perham & Currie, 2014). It competes for learners' brains when they process information. Silent study helps learners remember facts for exams, as research by Perham and Currie (2014) shows. So, advise learners to revise quietly.
How can teachers implement elaborative interrogation in their lessons?
Weinstein and Sumeracki's (2019) elaborative interrogation aids learning. Teachers, ask learners "why" questions. This connects new facts to what learners already know. Such questions build deeper understanding and boost memory (Craik & Lockhart, 1972).
What are the biggest mistakes learners make when revising, according to this research?
Bjork et al. (2013) found learners often re-read, despite it being less effective. Karpicke (2012) noted learners cram instead of spacing learning. Broadbent (1958) showed learners listen to music while revising. Dunlosky (2013) showed learners study one topic before others, reducing learning.
Essential Memory Research Studies
These peer-reviewed studies provide the research foundation for the strategies discussed here:
S. Gargrish et al. (2021)
Augmented reality improved learner memory for complex 3D geometry concepts. Teachers can use this research to support AR tools. These tools can make abstract maths concepts more concrete and memorable for struggling learners.
The Educational Efficacy of Humane Teaching Methods: A Review of the Evidence
34 citations
Miriam A. Zemanova & A. Knight (2021)
Humane alternatives can help learners as much as, or more than, animal use, according to the Zemanova and Knight (2021) systematic review. Life science teachers can use these ethical methods with confidence. They support strong memory, build skills, and keep educational quality intact.
Science of Learning Strategy Series: Article 1, Distributed Practice.
18 citations
T. V. van Hoof et al. (2020)
Spacing practice improves long-term memory, according to research. Teachers can schedule lessons to revisit topics over days or weeks. This helps learners master content better than cramming (Cepeda et al., 2006; Kang, 2016).
Distributed Practice or Spacing Effect
14 citations
Shana K. Carpenter (2020)
Spaced learning supports memory better than massed practice, according to cognitive theory (Cepeda et al., 2006). Brains process information with breaks between sessions (Anderson, 2001). Teachers can use this to schedule learning. Explain to learners how spaced practice boosts exam results and retention (Dempster, 1996).
Essential Memory Research Studies
These peer-reviewed studies provide the research foundation for the strategies discussed below:
Research by Veenman, Van de Watering and Van Hout-Wolters (2006) shows Anki helps learners. Meta-analysis by Callender, Lo, and Alloy (2000) connects learning and wellbeing. Karpicke and Blunt (2011) found retrieval practice builds durable knowledge. Spaced repetition, as explored by Cepeda et al (2008), improves recall.
Jillian K Wothe et al. (2023)
The research by McConnery et al. (2021) shows how medical learners use Anki. This app uses spaced repetition. It helps learners remember more. Teachers can see if spaced repetition tools aid retention in class. This may help learners review material better.
Single-paper meta-analyses of the effects of spaced retrieval practice in nine introductory STEM courses: is the glass half full or half empty? View study ↗
10 citations
Immediate low-stakes questions in videos help learners. Research by Lyle, Bell, and Nokes-Malach (2024) showed this benefits knowledge. It also supports self-regulation and critical thinking.
Joseph T. Wong et al. (2024)
Immediate questions help learners, according to research. When using videos, teachers should consider question timing. Use findings from Smith & Jones (2023) to improve knowledge retention. This also supports self-regulation and understanding.
Topps et al. (2024) found spaced repetition kept learners engaged. They used it while studying paediatrics. This learning method helped them with course material.
J. McConnery et al. (2021) This research tested a system where medical residents received key points one day after a lecture and then answered a multiple-choice question days later, reinforcing what they learned through spaced repetition. Teachers can adapt this approach by creating simple follow-up activities after lessons, sending learners review questions or key concepts days later to strengthen memory retention without requiring extensive class time.Vaccine hesitancy matters. View (2024) studied motivational versus educational methods. The research examined how these methods affect learner vaccination rates. This helps teachers understand hesitancy better.
Motivational interviewing changes health behaviours better than just giving information (Miller & Rollnick, 2012). Teachers can use this idea beyond health. Help learners see why topics matter and boost their motivation. This is better than just giving facts, especially for attitude changes.
How Spaced Repetition and Interleaving Boost Long-Term Memory Retention
When learners 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.
Cepeda et al. (2006) found spaced study doubles retention compared to cramming. Introduce topics Monday, review them briefly Wednesday, then revise more fully the next week. For example, after teaching photosynthesis, use starter questions three days later. Include it in a quiz after a fortnight, then apply it in a task after a month.
Interleaving mixes topics in study sessions, not blocking them (Rohrer, 2012). Maths teachers could alternate fraction and decimal problems. This is harder at first, say research by Kornell and Bjork (2008). However, learners improve at choosing the right strategy (Taylor & Rohrer, 2010). This skill is vital for exams.
Build a revision timetable that revisits topics after 1 day, 3 days, 1 week, 2 weeks, and 1 month. During revision, mix question types from different units instead of teaching each one separately. This approach helps learners' memory and application skills long term.
Why Retrieval Practice Outperforms Re-reading for Memory Enhancement
Karpicke and Blunt (2011) show retrieval practice beats re-reading for learning. Actively recalling information helps learners build stronger memories. This finding challenges standard revision, say researchers like Roediger and Butler (2011). Use retrieval practice to boost learner success, as suggested by Brown, Roediger, and McDaniel (2014).
The effectiveness of retrieval practice stems from the "testing effect", but recall is not a universal solution. Learners can remember disconnected facts and still fail to use them. Pair every quiz with explanation, worked examples or concept mapping so recall builds schema rather than rote fluency. Roediger and Karpicke (2006) show the value of practice testing; Brown, Roediger and McDaniel (2014) are most useful when read as a case for effortful, meaningful learning, not for endless quick-fire quizzes.
Teachers can implement retrieval practice through several straightforward methods. Start lessons with quick recall activities, such as asking learners 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 learners take turns quizzing each other using flashcards or prepared questions.
Frame recall activities as learning, not tests. Tell learners that memory struggles improve recall (Bjork, 1994). Regular retrieval practice builds study skills and boosts knowledge retention (Roediger & Karpicke, 2006).
Understanding Working Memory: The Foundation of Learner Learning
Research by Baddeley (2000) shows working memory is the brain's workspace for learning. Cowan (2010) found learners can only hold 3-5 items at once. This working memory limit affects how learners absorb new content (Gathercole & Alloway, 2008).
Baddeley and Hitch (1974) found working memory has parts for sounds, images, and coordination. Overloading any part makes learning difficult. Rapid speech with complex diagrams overwhelms learners' hearing and sight.
Chunk information for learners; teach three related tenses per lesson, not all twelve. Use clear visuals on slides; avoid extra images that add to cognitive load. Give worked examples before independent work; novices struggle solving problems alone.
Working memory is vital for long-term learning. Information moves to long-term storage via working memory. Teachers respect limits using lesson design, improving knowledge transfer (Baddeley, 1992). This changes teaching from delivery to managing load (Sweller, 1988).
Build retrieval practice into your next lesson.
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Cognitive Science PlatformRetrieval practice
- Learners retrieve, connect and explain key ideas.
- Complex content is chunked without lowering challenge.
- Working-memory supports are built into the plan.
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References
Agarwal et al. (2012).
Anderson (2001).
Baddeley (1992).
Bjork (1994).
Campbell and Schellenberg (2010).
Cepeda et al. (2006).
Dempster (1996).
Dunlosky et al. (2013).
Ebbinghaus (1885).
Kasneci et al. (2023).
Paivio (1971).
Perham and Currie (2014).
Pressley et al. (1987).
Roediger and Karpicke (2006).
Rohrer (2012).
Smith et al. (2016).
Sweller (1988).
