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MemoryMemory is how the brain takes information captured by our senses and turns it into experiences that can be stored and remembered in the future. Instead of a perfect recording system, the brain selects a subset of sensory data for processing in short-term memory before storing it in long-term memory for future recall. This means remembering creates incomplete reconstructions of knowledge.
Memories are stored throughout the brain in networks of neurons that were electrochemically activated when our lived experiences first took place. The hippocampus—a seahorse-shaped structure in the brain—triggers reactivations hundreds or thousands of times while we sleep to reinforce and "store" them in long-term memory. Repetition and other techniques can also be used to accomplish this reinforcement and storage.
The conscious act of remembering something involves reactivating those neurons and reconstructing the experience from stored sensory details. Scientists believe most problems with memory arise from issues with neuron reactivation or the initial storage of sensory information.Explore Memory
What we've found
Smell is a robust memory cue for individuals with Alzheimer's diseaseOdor is more effective than both visual and verbal cues for triggering autobiographical recall in Alzheimer's disease, according to 2021 research. Psychology TodayScent is a stronger memory trigger than sightSmell is imbued with more emotion than visual memories, and research indicates that smell triggers a significantly greater effect on amygdala activation. Scientists believe these powerful responses occur partly because smell signals bypass the thalamus and go directly to the amygdala and hippocampus, brain areas involved in emotion and memory. Cleveland ClinicTest your memory by finding matching pairs See how computer memory really works—from binary bits to modern RAMThe video explains how computers store information as 1s and 0s, how RAM functions as fast working memory, and why systems utilize different types of storage. The video demonstrates how this process enables computers to operate. TED-EdSuper recognizers may use specific facial features to commit faces to memoryResearchers believe that recognizing individuals seen only in passing, even decades later, is an ability of genetic origin and specific to facial recognition, rather than a result of better overall memory or perception. Applying eye tracking data from super recognizers to AI has led to improvements in facial recognition software. Science WeeklySuper-agers: seniors 80 and above with the memory ability of people in their 50sStudies show the number one indicator of whether someone is a "super-ager" is not diet or genetics, but the extent of their social relationships. Moreover, scans reveal noticeable physical differences in certain parts of the brain in patients with extensive social networks. Plain EnglishShape memory alloys 'remember' their previous form and restore themselves if deformedNitinol, one such alloy, can bend back into its trained shape if exposed to heat because of a solid-to-solid phase transformation. Some showerheads already use nitinol to regulate hot water and prevent unintentional burns. Verge ScienceADHD impairs working memory and limits the ability to form long-term memoriesWhile ADHD is most often recognized for producing struggles with attention and organization, these executive functions are critical for capturing the data that creates memories in the brain. Breaking data into pieces, or chunking, helps address these struggles. THINK Neurology for KidsLong-term memory formation may not need short-term memoryNew research shows that long-term memories can still develop even when short-term memory formation is blocked, suggesting the brain uses separate pathways for short- and long-term memory. This discovery could help scientists open new avenues for treating memory loss in diseases like Alzheimer’s. MPFNeuroSensory memory is information collected from your sensesLasting seconds before moving into short-term memory or being forgotten, sensory memory aids in environmental awareness and navigation. Key brain regions involved include auditory, somatosensory, gustatory, visual, and olfactory cortices. Cleveland ClinicShort-term memory is a temporary space for limited, newly learned informationShort-term memory stores info for 15 to 30 seconds and is managed by the prefrontal cortex. Though they're often confused, short-term memory stores information, while working memory actively uses it to help you reason, learn, and solve problems, such as a math equation. Cleveland ClinicVarious types of memory, each serving unique functions, create a complex brain systemThese forms of memory, which can overlap in daily life, have been sorted into broad categories, such as short-term and long-term memory, and subtypes such as implicit memory, which uses saved information without conscious awareness that it’s being recalled. Psychology TodayThe hippocampus, a structure in the brain, plays a crucial role in memory formationThe seahorse-shaped structure transfers short-term memories to long-term storage during sleep. It is located in the temporal lobes, above each ear, and aids in spatial navigation and remembering directions. WebMDMemory exists as multiple types stored across various brain systemsMemory isn't one uniform function—it's made up of multiple systems, like declarative (facts/events) and non-declarative (skills/habits), which involve different brain areas such as the hippocampus, amygdala, and cerebellum. Neuro TransmissionsPatient H.M. revealed that the hippocampus was responsible for memory formationHenry Molaison became a landmark case in psychology after surgery removed large portions of his hippocampus, leaving him unable to form new memories. Upon his death, Molaison's brain was sliced into 2,401 sections and digitized for research. Simply PsychologyThe limbic system drives emotion, memory, and survival instincts in the brain.This interconnected group of brain structures—including the amygdala, hippocampus, thalamus, and hypothalamus—processes emotional responses, regulates bodily functions, and plays a key role in memory and learning. Science ABCSharp wave ripples in the brain tag experiences for long-term memory storageThese ripples were known to quickly replay neuronal sequences during sleep for consolidation. While awake, they help the brain prioritize memories to remember, and their disruption can impair memory formation. Quanta MagazineMemory disorders disrupt the brain's ability to make, store, or recall memoriesThese disorders stem from reversible issues like vitamin deficiencies or irreversible causes such as stroke or dementia. Only one type of dementia—familial Alzheimer’s disease—is directly inherited and accounts for about 20% of Alzheimer’s cases. HealthlineMemory is a complex narrative constructed from real and imagined experiencesMemories start with perception and are processed in the hippocampus. Different types of memories use different brain regions, and episodic memory, which is involved in recalling one's life events, is more susceptible to decay than semantic memory, which is involved in general information. Psychology TodayPhysiological muscle memory allows us to quickly regain lost musculatureThe term "muscle memory" is most often associated with the neurological kind, which involves the development of strong and efficient neural pathways in the brain and spine. Physiological muscle memory also slows the loss of muscle mass, with both types affected by genetics and diet. CNNWatch a USA Memory Champion answer questions about memorySix-time USA Memory Champion, Nelson Dellis, answers popular questions about memory, from how sleep, stress, emotion, and attention influence memory to ways techniques like the memory palace, mnemonics, and the PAO system can dramatically improve recall. WIREDPhotographic memory isn’t real, but other rare memory types do existWhile 2% of children can recall sensory experiences with extreme detail (eidetic memory) and some adults can remember life events or dates with high accuracy (hyperthymesia), there is no scientific evidence for the flawless recall popularized in fiction. Most memory feats instead rely on training and memorization techniques. Stuff You Should KnowDéjà vu is a memory illusion involving brain regions correcting inaccurate memoriesNeuroscientists suggest the phenomenon is your brain recognizing that this feeling of familiarity is incorrect, showing off the brain's internal fact-checking system. Younger people experience déjà vu more often because their brains have higher excitatory activity and stronger memory monitoring systems. BBC Science FocusResearchers use the brain's ability to edit memories to explore memory deletionScientists have successfully implanted false memories in mice after studying how the editing process works in the brain. Beyond potentially deleting memories in those with PTSD, upcoming research may allow clinicians to forecast the onset of neurodegenerative diseases. National GeographicEngrams are the specific pattern of brain cells that make up a memoryMemory isn’t stored in your brain in a neat little package but is instead spread across a pattern of cells in different regions. Understanding this process could lead to better treatments for conditions like Alzheimer’s or PTSD. SciShow PsychWhen to see a doctor over memory lapsesMemory includes various, distinct functions, like working memory (storing information temporarily) and procedural memory (your body's ability to perform a task unconsciously). Forgetting a word or losing your keys can feel like red flag memory lapses, but they are, in fact, language or attention problems, not memory ones. However, a lapse on top of stress, lack of sleep, chronic dysfunction, or an injury may be a red flag to see your doctor. SELFThe ideas of Einstein and Freud combined in 'The Persistence of Memory'The Persistence of Memory was painted on a canvas roughly the size of a sheet of paper, depicting a desolate landscape with melting clocks, ants, and a distorted figure. The piece incorporates Freud and Einstein's ideas, resulting in a haunting composition symbolizing time's fluidity and Dalí's personal anxieties. The Museum of Modern ArtNASA fixed Voyager 1’s glitchy memory from 24 billion kilometers awayIn November 2023, Voyager 1 began sending unusable data due to a stuck bit in a decades-old memory chip. After months of investigation, engineers managed to reroute the faulty code to a new memory location, restoring functionality in April 2024. IEEE SpectrumCRISPR-Cas systems act as genetic memory banks for defending bacterial cellsWhen viruses called phages inject DNA into bacteria, some bacterial species store bits of this DNA in their own genomes. This allows them to recognize and destroy the same virus if it attacks again. Max Planck SocietyHow does muscle memory work?Muscle memory is less about remembering how to ride a bike and more about what's happening in muscle cells. Increasing the cells' size, say by working out, leads to an increase in nuclei, which increases the production of mitochondria. When your fitness regimen falls to the wayside and you decide to re-enter the gym, these gains-based nuclei are already present to quicken muscle cells' adaptation to exercise. OutsideAge, stress, and neurological disorders can prevent memory formation and recallNeurons transmit signals between one another at sites called synapses. Repeated interactions at these sites improve the efficiency of signal transmissions, making memories involving sensory data associated with those neurons easier to recall. Biochemical factors impacting these synaptic interactions affect memory quality. TED-EdHow dreams affect your memoryIn 1999, scientists conducted a study in which participants were asked to recall images flashed before them for milliseconds. They found that participants who slept before recalling the information performed better than those who had been asked to recall the same information that same day. This was some of the earliest convincing evidence of how crucial sleep is for learning and memory, findings that current research continues to strengthen. Harvard UniversityHow a single man taught the world about memoryHenry Molaison taught us about memory by losing his. Psychology TodayMark Zuckerberg met his wife, Priscilla Chan, at HarvardIn Zuckerberg's 2017 commencement speech at Harvard, Zuckerberg said his best memory at Harvard was meeting Priscilla Chan in line for the bathroom at a party. In that speech, he said he told her, "I'm going to get kicked out in three days, so we need to go on a date quickly." The pair got married in 2012 and now have three kids together. People.comRoughly half of the world's nations are (relatively young) electoral democraciesClassifying countries by governance type involves leaning into technical systems like the Regimes of the World classification. In this data dive, see a map of the world's oldest and youngest electoral democracies, as well as liberal democracies (which are measured by the protection of minorities and checks on executive power from the legislature). Our World in DataJudith Resnik was the second American woman to fly in spaceA PhD in electrical engineering, Judith "Judy" Resnik flew aboard Space Shuttle Discovery in 1984, becoming the second American woman in space, and later served as a mission specialist on Challenger's STS-51L mission. Ohio MemoryMark Twain invented an unsuccessful board game“Memory Builder” was based on pinning historical events in their correct chronological order. It was test-marketed in 1891, but never took off. One critic said, “The game looked like a cross between an income tax form and a table of logarithms.” Twain QuotesConsistency and emotional engagement can improve the formation of memoriesWhile sleep lets the brain re-trigger neurons associated with our experiences to cement them in long-term memory, repeating actions, like storing one's keys in the same location, can mimic these benefits. Emotionally charged memories are often ruminated upon, improving their future recall. Science VsIndigenous women crafted the integrated circuits for the Apollo Guidance ComputerApplying their blanket-weaving skills, over 1,000 Navajo women in New Mexico were hired to connect circuit components in intricate patterns using a microscope. Outside Boston, "rope mothers" at the Raytheon facility wove the AGC's core memory using threaded metal wires. Science NewsMemories are formed through attention, repetition, and emotional significanceOur brains create memories by taking in sensory input, filtering it through short-term memory, and storing it in long-term memory. Emotional events are more likely to become vivid, lasting memories because they activate stronger neural connections. Sprouts100 of Broadway's best songsFrom the pathos of "One Day More" from "Les Misérables," to the soaring "Defying Gravity" from "Wicked," this video showcasing 100 of Broadway's best songs will keep any musical theater lover quite busy. While the list trends toward modern pieces, there are still plenty of selections from classics and Tony Award winners like "Fiddler on the Roof" and "Miss Saigon." MsMojoThe early art of Dalí represents peak surrealismWhen it debuted in New York in 1932, "The Persistence of Memory" captured international audiences with its absurd, dream-like reflection on time. In his later works, Dalí's work evolved and became more of a self-parody. This video breaks down the great Spanish artist's works. Great Art ExplainedYour brain moves through four distinct sleep stages every nightEach stage plays a key role in memory, repair, restoration, and other key biological functions. The full cycle generally proceeds from light sleep and deep rest into vivid REM dreaming, which repeats between three and five times nightly. 1440The Tony Awards, explainedBroadway's top honor began in 1947, when the American Theatre Wing created the Tony Awards in memory of Antoinette "Tony" Perry. From scrolls and cigarette lighters to today's iconic medallion, the Tonys have evolved into a nationally televised celebration of Broadway's best. 1440Space travel sparked inventions we now use every dayTechnologies developed for space exploration produced lasting spinoff innovations—from camera phones to memory foam—displaying how the Space Race reshaped everyday life here on Earth NASAReflections on lesser-known objects at the MetNate DiMeo’s podcast The Memory Palace tells the stories hidden beneath the surface of familiar people and places. In 2016, he was named the Met’s Artist in Residence. While there, he produced eight episodes about the museum, exploring its lesser-known objects and lore. Check out the first of the series here. The Memory PalaceArtificial general intelligence equals or surpasses human intelligenceAGI incorporates sensory perception, memory, and advanced logical inference systems to move beyond the narrow tasks seen in large language models and chatbots. One of the most significant hurdles in developing AGI is designing systems that learn and can flexibly apply learning across domains. Lex FridmanRoughly one in every 250 has never remembered a single dreamMost people dream for about two hours every night and recall about two dreams per week, and memory encoding is especially fragile upon waking. Alarms can knock dreams right out of one's head, and dream recall may be influenced by personality, interest, and socialization. DiscoverThe hippocampus plays a central role in dreamingIt's theorized that the hippocampus—a brain structure involved with memory formation and the simulation of imagined and novel scenarios using those memories—plays a major role in dreaming. Studies of people with damaged hippocampi show that they still dream, but their dreams lack the richness of detail described by others. National Institutes of HealthCan your identity be preserved amid dementia?Memory loss associated with progressive dementia raises questions about whether a person's identity can be maintained during the disease's progression. One outlook suggests we define ourselves by our social relationships—offering a potentially more humane approach to caring for those with dementia. Aeon
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