What is it about?
Why do we remember certain moments while forgetting others? Every day, our minds are bombarded with thousands of pieces of information, yet our brains have a limited capacity to consolidate these experiences into lasting memories. This means we need a way to hold on to what is most important, and disregard irrelevant details. In our new research, we uncover a neural mechanism that instructs the brain which daily experiences to save as long-term memories during sleep. Specifically we found that during learning, a specific brainwave pattern known as a “theta rhythm” provided an instructional cue to help organise brain activity during later sleep. Those memories with a particularly strong theta rhythm at learning were preferentially strengthened during sleep, ultimately leading to better memory recall
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Why is it important?
Everyday we encounter more information through our senses than is biologically plausible, or even relevant, to remember. Therefore the brain must have a way of filtering out irrelevant information, such at only important experiences enter long-term memory. Our results provide novel evidence that tagging important information during learning is one way that the brain avoids system overload by only retaining what is relevant.
Perspectives
How the brain decides what is important to remember and what can be forgotten is still a mystery. These new findings help to answer that question, by uncovering for the first time a signature of neural activity which instructs the brain which experiences to process during sleep and form into long-term memories. If we remembered everything that we experienced, our brains would quickly reach system overload. By selectively prioritising important events in our lives, be they emotionally salient or important for the future, we are able to use our past experiences to help guide our interactions in the world.
Dan Denis
University of York
Read the Original
This page is a summary of: Theta oscillations tag episodic memories for sleep-dependent consolidation, PLoS Biology, August 2026, PLOS,
DOI: 10.1371/journal.pbio.3003938.
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