Living in a fast-paced world, people often react to forgetfulness with frustration and panic.
However, a neuroscientific study published in the journal Neuron suggests that occasional forgetfulness is not necessarily a cognitive flaw. Instead, it may be part of how the brain optimizes memory and supports intelligent decision-making.
The challenge, however, lies in distinguishing normal forgetfulness from the early warning signs of a progressive neurological condition.
WHY DO BRAINS FORGET?
For decades, memory researchers primarily focused on how the brain stores and retrieves information, often treating memory loss as a system failure.
In a study published in Neuron, researchers Paul Frankland and Blake Richards of the University of Toronto argued that memory is not meant to function as a recording device. Rather, its purpose is to support decision-making in complex and constantly changing environments.
To achieve this, the researchers found that the brain actively engages in neurobiological mechanisms that promote memory loss, a process known as “forgetting.”
The study identified two key functions of active forgetting that support intelligent thinking.
First, retaining too many details can lead to what researchers call “overfitting.” This occurs when the brain becomes overly dependent on specific past experiences and struggles to apply lessons to new situations.
By discarding irrelevant details, the brain can identify broader patterns and general rules, allowing individuals to adapt more effectively to unfamiliar environments.
Second, old information can become outdated as circumstances change. New information can then overwrite or weaken existing neural connections, allowing the brain to prioritize current and relevant information over obsolete memories.
In other words, forgetting unnecessary details may help the brain focus on broader patterns, supporting flexible thinking, adaptation, and problem-solving.
WHEN MEMORY LOSS BECOMES A WARNING SIGN
While forgetting minor details is a normal part of life, significant or worsening memory loss can also be an early indicator of neurological decline, according to the World Health Organization (WHO).
The WHO estimates that more than 55 million people worldwide live with dementia, with Alzheimer’s disease accounting for 60% to 70% of cases.
To distinguish normal forgetfulness from possible dementia, healthcare professionals assess several indicators, including the severity of memory problems and their effects on daily life.
Occasionally forgetting minor details can be a normal part of aging. However, repeatedly forgetting recent events, important personal information, or entire conversations may warrant medical attention.
Normal forgetfulness generally does not interfere significantly with daily activities. In contrast, people with dementia may become disoriented in familiar places or struggle to carry out routines they previously managed with ease.
Dementia also involves more than memory loss. It may be accompanied by changes in mood and personality, spatial disorientation, and progressive difficulties with communication.
“In this perspective, we have emphasized that memory should not be viewed simply as a means for high-fidelity transmission of information through time. Rather, we stressed that the goal of memory is to guide intelligent decision-making,” the Neuron study said.
However, when memory lapses begin to interfere with essential daily activities, cause disorientation in familiar settings, or worsen over time, seeking a medical evaluation is important.
DEMENTIA AS A PUBLIC HEALTH PRIORITY
The WHO has identified dementia as a public health priority, calling for coordinated action to address its growing impact worldwide.
In May 2017, the World Health Assembly endorsed the Global Action Plan on the Public Health Response to Dementia 2017–2025. The plan’s implementation period was subsequently extended to 2031.
The comprehensive plan provides a framework for policymakers, the WHO, and international and regional partners to strengthen efforts to address dementia as a public health challenge.
