Forgetfulness and Memory Gaps: Normal or Pathological? How to Remedy It
Understand why we forget, recognize warning signs, and take concrete action to preserve our memory
Have you been searching for your keys for ten minutes, forgotten the name of an acquaintance, or left the supermarket without the main item you came for? Do these situations sound familiar? You are not alone. Forgetfulness and memory gaps are part of the daily life of millions of people. But when is it normal, and when should we be concerned? Where is the line between ordinary distraction and cognitive decline that deserves attention? This article reviews the mechanisms of forgetting, the signs to watch for, and all the available solutions to preserve and improve memory.
Is Forgetting a Weakness of the Brain?
Contrary to what one might think, forgetting is not a brain dysfunction. On the contrary, it is an active, essential, and even necessary mechanism for the proper functioning of memory. Without forgetting, our brain would be overwhelmed by a continuous flow of unimportant information, unable to distinguish the essential from the trivial.
Neuroscientist Richard Semon, and more recently researchers like Paul Frankland and Blake Richards, have shown that active forgetting is an adaptive function of the brain. Erasing insignificant details allows for the retention of general patterns, improves the generalization of learning, and frees up cognitive capacity for new information.
“Forgetting is not the opposite of learning. It is a fundamental function that allows the brain to remain flexible, avoid overload, and keep truly important information.”
The Different Types of Forgetting
Not all forgetfulness is the same nor caused by the same mechanisms. Distinguishing the different forms of forgetting allows for a better understanding of their origin and appropriate responses.
Forgetting by Decline
The memory trace naturally weakens over time if it is not reactivated. This is Ebbinghaus's forgetting curve.
Forgetting by Interference
Similar information interferes with each other. New learning disrupts old ones, and vice versa.
Motivated Forgetting
The brain can "put on hold" painful or anxiety-inducing memories to protect itself psychologically.
The encoding failure
The information was never actually memorized because attention was insufficient at the time of the experience.
Normal forgetfulness: don't panic unnecessarily
The vast majority of everyday forgetfulness is perfectly normal and does not indicate any disease. Understanding the mechanisms of these benign forgetfulness helps demystify them and avoid unjustified anxiety that ironically exacerbates memory difficulties.
The 7 normal sins of memory
Psychologist Daniel Schacter from Harvard University described seven forms of memory imperfection that he qualifies as "normal":
Common forgetfulness that should not worry
- Transience: gradual forgetting of unreactivated memories over time. Normal and adaptive.
- Distraction: forgetting related to a lack of attention at the time of encoding. "Where did I put my keys?"
- The word on the tip of the tongue: temporary blockage in retrieving a word or name. Frustrating but common.
- Misattribution: remembering information but attributing it to the wrong source or person.
- Suggestibility: involuntary integration of external information into one's own memories.
- Bias: retrospective distortion of memories by current knowledge, opinions, and emotions.
- Persistence: inability to forget painful or obsessive memories (the opposite of forgetting).
Frequent causes of benign forgetfulness
Before worrying about memory, it is important to examine the everyday factors that directly affect memory performance. These causes are common, reversible, and do not indicate any neurological impairment.
😴 Lack of sleep
Sleep is essential for the consolidation of memories. During deep sleep and REM sleep, the brain "transfers" information from short-term memory to long-term memory. An insufficient or poor-quality night significantly degrades episodic memory performance the next day, and cumulatively over the weeks.
😰 Stress and anxiety
Acute stress can temporarily enhance memorization (survival mechanism), but chronic stress has the opposite effect. Prolonged excess cortisol damages the hippocampus, the brain structure key to episodic memory. Anxiety also monopolizes attentional resources, leaving not enough "bandwidth" to properly encode information.
📱 Cognitive overload and multitasking
Our brain is not designed for multitasking. When we do several things simultaneously (looking at our phone while listening to someone), encoding is superficial and later retrieval is difficult. Constant digital distractions fragment attention and impoverish the quality of memory.
💊 Some medications and substances
Many common medications can affect memory: benzodiazepines, sleeping pills, first-generation antihistamines, certain antidepressants, beta-blockers. Alcohol, even in moderate amounts, disrupts nighttime memory consolidation. If you notice a deterioration in your memory after starting a new treatment, talk to your doctor.
💡 Quick test: is your memory within the norm?
DYNSEO offers an online memory test that allows you to quickly assess your memory abilities and compare them to your age group. You can also estimate the mental age of your brain. These tests do not replace a medical consultation, but provide a useful initial benchmark.
When to worry? Warning signs not to ignore
While most forgetfulness is benign, certain signs warrant a medical consultation. The goal is not to panic, but not to delay a diagnosis that, if it reveals a pathology, will allow for earlier and therefore more effective management.
The differences between normal and pathological forgetfulness
Comparison table: benign forgetfulness vs pathological forgetfulness
| Benign forgetfulness (normal) | Warning sign (to evaluate) |
|---|---|
| Occasionally forgetting where you placed your keys | Leaving your keys in unusual and repeated places (refrigerator, etc.) |
| Searching for a name that you find shortly after | No longer recognizing loved ones or familiar faces |
| Occasionally forgetting an appointment | Consistently forgetting recent events while remembering distant past |
| Searching for words when tired | Significant and increasing difficulties finding words in conversation |
| Reading a page and needing to reread it | Gradual abandonment of reading due to increasing incomprehension |
| Getting lost in an unfamiliar place | Getting lost in perfectly known places (your neighborhood, your home) |
| Repeating a story that you may have already told | Repeating the same story multiple times in the same conversation, without realizing it |
⚠️ Signs requiring urgent medical consultation
Some symptoms should lead to a quick medical consultation: sudden and severe memory loss, temporary confusion about the place or date, sudden inability to recognize loved ones, sudden difficulties in speaking or understanding language. These symptoms may signal a Stroke or a transient ischemic attack and require emergency care.
Mild Cognitive Impairment (MCI): between normal and pathological
Between normal memory complaints and confirmed dementia, doctors have defined an intermediate entity: mild cognitive impairment (MCI). It is characterized by objectively measurable cognitive difficulties (notably in neuropsychological tests), greater than what would be expected for age, but insufficient to speak of dementia as daily activities remain largely preserved.
MCI is important to identify as it constitutes a risk factor for dementia, particularly Alzheimer's disease. Over five years, about 30 to 40% of people with MCI develop dementia. But the other side of MCI is that 30 to 40% of people return to normal cognitive functioning, especially when modifiable factors (depression, hypothyroidism, vitamin B12 deficiency, poor sleep) are treated.
The main pathological causes of memory disorders
When forgetfulness is persistent, progressively worsens, and interferes with daily life, several medical causes must be explored by a doctor.
Reversible causes not to be overlooked
Before thinking of dementia, it is crucial to rule out reversible causes of memory disorders, which are common and treatable:
Frequent reversible causes
- Depression: often called "pseudodementia," it can cause significant memory and concentration disorders, reversible with treatment.
- Hypothyroidism: an underactive thyroid slows down brain metabolism and can cause cognitive fatigue, forgetfulness, and slowed thinking.
- Nutrition deficiencies: deficiencies in vitamin B12, B9 (folates), vitamin D, or iron can cause significant cognitive disorders.
- Sleep apnea: repeated micro-awakenings disrupt memory consolidation and cause chronic cognitive fatigue.
- Medication side effects: many medications affect memory (see above).
- Alcohol: regular consumption, even moderate, impairs memory consolidation over time.
Alzheimer's disease and other dementias
Alzheimer's disease is the most common cause of dementia (60-70% of cases). It typically begins with recent episodic memory disorders (forgetting recent conversations, appointments, recent events) before progressively affecting other cognitive functions. Other dementias — vascular, Lewy body, frontotemporal — present different cognitive profiles, sometimes with more early executive or behavioral disorders than memory disorders.
🌟 SCARLETT – Cognitive stimulation tailored for seniors and people with dementia
Designed for seniors and individuals supported in their cognitive aging journey, the SCARLETT program from DYNSEO offers memory stimulation activities tailored to each user's level. Remembrance, attention, recognition, and evocation exercises of autobiographical memories help maintain residual cognitive abilities and preserve quality of life.
Discover SCARLETT →What to do about forgetfulness? Practical and scientific strategies
Whether it is benign forgetfulness related to lifestyle or a desire to prevent cognitive decline, many effective strategies exist. They combine proven memorization techniques, lifestyle changes, and regular cognitive training.
Optimize encoding: memorize better from the start
Most forgetfulness is not a retrieval problem but an encoding issue: the information was never properly recorded. Improving the quality of encoding is therefore the first step to reducing forgetfulness.
🎯 Deliberate attention
Before putting something away, noting an appointment, or learning information, consciously take two seconds to tell yourself what you are doing. This internal or vocal verbalization forces the brain to deliberately encode the information rather than processing it "in automatic mode."
🔗 The association and the context
Linking new information to something you already know multiplies the mnemonic "hooks" and facilitates retrieval. Associating a name with a famous face, a date with a personal event, a number with a mental image: these associations enrich the memory trace.
📝 Strategic externalization
Using external supports (agenda, lists, reminder apps, whiteboard in the kitchen) is not a sign of memory weakness: it's an intelligent strategy that frees working memory for more complex tasks. The session tracking sheet from DYNSEO allows you to record your activities and observations in a structured way.
Proven memorization techniques
Beyond everyday strategies, scientifically validated memorization techniques allow for better anchoring of important information.
🔄 Spaced repetition
Rather than reviewing information many times in a row (cramming), it is much more effective to review it at increasing intervals: after 1 day, then 3 days, then 1 week, then 1 month. This technique, called spaced repetition, exploits Ebbinghaus's forgetting curve to maximize long-term retention with minimal effort.
🗺️ The method of loci (memory palace)
A technique used by memory champions since antiquity, it involves associating information with specific locations in a familiar imaginary place (your home, your daily route). To retrieve the information, you simply need to "walk" mentally through this place. Very effective for memorizing lists, speeches, or sequences of information.
Regular cognitive training
Cognitive training is one of the best-documented interventions for preserving and improving memory. Large-scale studies, including the famous ACTIVE study (Advanced Cognitive Training for Independent and Vital Elderly), have shown that 10 sessions of targeted cognitive training can lead to lasting benefits over several years.
🧠 CLINT – Personalized memory training for adults
The CLINT program from DYNSEO offers exercises in episodic memory, working memory, attention, and processing speed, automatically tailored to the user's level. A few minutes a day are enough to maintain an effective cognitive training routine. Tracking progress allows you to visualize improvements and maintain motivation.
Try CLINT →Lifestyle: the essential foundation
No cognitive exercise can sustainably compensate for a lifestyle that weakens the brain. Research converges on four fundamental pillars to preserve long-term memory.
Physical activity
30 minutes of moderate aerobic activity, 5 times a week, reduce the risk of dementia by 28% according to recent meta-analyses.
Quality sleep
7 to 9 hours of sleep per night optimize memory consolidation and the elimination of brain toxins (glymphatic cleaning).
Brain food
The Mediterranean diet (olive oil, fatty fish, legumes, colorful vegetables) is associated with less cognitive decline with age.
Active social life
Regular social interactions stimulate multiple brain networks and are a powerful protective factor against cognitive decline.
"At 68, I had started to really worry about my memory. I was constantly searching for my words, forgetting entire conversations from the day before. My doctor first ruled out reversible causes (I had a B12 deficiency and was sleeping very poorly due to undiagnosed sleep apnea). Since these issues have been addressed, and I've been using SCARLETT every morning, my difficulties have significantly reduced. My doctor now talks about 'memory within the normal range for my age.' It has changed my relationship with aging."
When and how to consult a healthcare professional?
If you or a loved one are experiencing concerning memory lapses, the recommended consultation process generally follows several steps.
The general practitioner: first point of contact
The primary care physician is the first point of contact for a memory complaint. They conduct an initial assessment: a questionnaire on the nature and evolution of the lapses, biological tests (thyroid, vitamin B12, blood sugar), sleep evaluation, review of medications, and quick screening cognitive tests (MMS, clock test, MoCA).
The neurologist and neuropsychologist
If the general practitioner's assessment reveals abnormalities or if the complaint is significant, a referral to a neurologist or a geriatrician specialized in memory is often suggested. A comprehensive neuropsychological assessment allows for precise profiling of cognitive disorders. Brain imaging tests (MRI) may complement the assessment.
🎓 DYNSEO Training for Professionals
For healthcare and medico-social professionals supporting individuals with memory disorders, DYNSEO offers specialized training on neurodegenerative disorders and adapted cognitive stimulation techniques. These trainings are eligible for DPC and are based on the latest data in clinical neuropsychology. Also, check our skills tracking chart to structure the follow-up of supported individuals.
Conclusion: act early, act wisely
Memory lapses and gaps are part of normal life, and the vast majority of them do not indicate any pathology. They often reflect a distracted, tired, stressed, or under-trained brain — realities of modern lifestyle that can be addressed concretely.
Understanding the difference between a benign lapse and a warning signal is a valuable skill that helps avoid two opposing pitfalls: excessive anxiety over normal lapses, and complacent inaction in the face of signs that warrant a consultation. In case of doubt, consulting remains the best decision.
Whatever your situation, you can take action today. Start by assessing your memory capabilities with the DYNSEO memory test, adopt good lifestyle habits, and explore our applications to incorporate regular cognitive training into your daily routine.