Friday, February 28, 2025

Effects of Spaced learning on Memory Encoding and Retrieval


 

Throughout the development of students from their youth until young adulthood, and beyond, our institutions strive to teach us concepts and basic courses to aid in critical thinking and problem solving that is crucial when navigating life. While every student can excel in their favorite subjects, it is important to know how the learning is done. Certain learning styles that work for students in a subject they have a high affinity for will not work for other, more challenging courses that require more time and effort, regardless of student preference. Because Western education strives on test-taking systems and point averages to quantify the amount of learning an individual student has done, learning has become an interwoven memory as it is needed to remember key concepts to use in applied questions or recall facts. While one would think seeing information in large and concentrated blocks, researchers at York University in Toronto found that smaller and more spaced-out blocks of studying are much more effective at allowing the brain to retrieve newly learned information and remember what was just learned.

In further detail, the students who participated in the York University spaced learning experiment were asked to attend a meteorology lecture for 45 minutes. While the control group took an online quiz the day after the lecture, the experimental group took the same quiz eight days later. The two other factors in the quiz were the complexity of questions: out of the 40-question quiz, 20 were factual, where a recall of information was necessary, and the other 20 were applied questions that required the recall of concepts and successful application. Five weeks after the quiz, and at the end of the experiment, both groups took a final test where the experimental group did significantly better. More specifically, they performed a half-letter grade better than the control group in absolute performance: both in applied and factual questions.   

While no shocks were administered to the students taking the exams, learning, and memory play a critical role in the hippocampus. In Dr. Grella’s experiment, the emotions connected to hippocampus-mediated memories were altered by inducing a shock on mice who had their dentate gyrus tagged by a mix of viral components. After shock-based conditioning, the mice’s memory of their environment where they experienced the jolt elicited a learned fear response in behavior, as shown in the reactivation of the ventral dentate gyrus after tagging from the viruses. Furthermore, in different environments, the fear-based behavior of freezing was reduced to that of anxiety-like actions. This suggestion is also found in learning processes much like that of spatial learning: the location where information is processed and encoded in memory will aid in its recall. Furthermore, the more associations that are made to the memory, such as different spaces and emotional states of the individual forming the memory, the stronger and quicker it can be recalled.  Even though behavior is unaffected by this, it is a contributing factor to the informal theory of spacing effect learning.  

Conclusion: In conclusion, through observations done by test-based studies like that of the York University staff and the more in-depth experiments with mice and dentate gyrus pathways done by Dr. Grella, how fast learning and memory can be encoded and processed rely on several different factors.

 

References:

https://www.sciencedirect.com/science/article/pii/S0959475214001042?via%3Dihub

https://www.brainfacts.org/thinking-sensing-and-behaving/learning-and-memory/2021/the-neuroscience-behind-the-spacing-effect-030421

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