In the scientific literature, cognitive aging as a natural process has been extensively established. Vocabulary is one cognitive skill that is resistant to brain aging and may even get better with age. Over time, other skills, including conceptual reasoning, memory, and processing speed eventually deteriorate. The pace of decrease in certain abilities, such as processing speed and perceptual reasoning tests, varies significantly among older persons.
Concern or difficulty with thinking, memory, concentration, and other brain functions beyond what is usually expected with age is referred to as cognitive decline in older persons. The brain diminishes in size with age, neural networks become less effective, neurons and synapses disappear, alterations arise in cerebral vasculature and metabolism, and brain inflammation levels rise. As we age, our lifestyles also change; after retirement, many people become less cognitively active, social networks may get smaller, and physical activity levels frequently decline. Beginning in our 20s and 30s, these physiological and social changes culminate in observable changes in cognitive performance in the decades that follow.
Cognitive impairment, or cognitive decline, can occur gradually or quickly, and it can also be transient or permanent. Both the person exhibiting the symptoms and their friends and family may find it frightening.
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Risk Factors for Cognitive Decline
Like other types of dementia, Alzheimer’s disease has a number of risk factors. Research indicates that these modifiable risk factors may be associated with around 50% of instances of Alzheimer’s disease:
- Diabetes, type 2
- Elevated blood pressure
- Obesity in middle age
- Depression from Smoking
- Minimal or nonexistent mental effort
- Minimal or nonexistent physical activity
Symptoms of Cognitive Decline in Older Adults
As you age, your brain changes too, just like the rest of your body. Growing older is often accompanied by an increase in forgetfulness. It could take longer to come up with a word or to remember someone’s name. However, persistent or growing anxiety regarding your mental abilities could indicate cognitive deterioration. Among the most typical symptoms are:
- Forgetting more frequently
- Ignoring crucial appointments or social obligations
- losing your flow of ideas or a discussion, a book, or a movie
- Feeling more and more stressed out when it comes to choosing a course of action, organizing steps to complete a task, or comprehending instructions
- Finding it challenging to navigate familiar surroundings
- Exhibiting poorer judgment or becoming more impetuous
- Your friends and family notice changes.
Let’s look into the deeper knowledge of how different types of cognition tend to occur while aging
1. Attention:
The capacity to concentrate and focus on particular stimuli is referred to as attention. When a series of numbers, is repeated, simple auditory attention span—also referred to as instantaneous memory—shows just a modest deterioration in later life. 4 When it comes to more difficult attention tasks like divided and selective attention, the age effect is more apparent.15, 16 The capacity to pay attention to particular information in the environment and ignore other, unimportant information is known as selective attention. For tasks like operating a vehicle or having a conversation in a noisy environment, selective attention is crucial. The capacity to focus on various tasks at once, like cooking while on the phone, is known as divided attention.
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When it comes to working memory tasks—which test an individual’s capacity to manipulate information while temporarily storing it in memory—older adults also do worse than younger adults. For instance, figuring out how much to tip on a restaurant bill or sorting a series of characters and digits in the right alphanumerical order may be challenging for older people.
2. Language:
Crystallized and flexible cognitive capacities make up the complex cognitive domain of language. With aging, overall language ability does not change. Over time, vocabulary holds steady and even gets better. A few exceptions to the general trend of stability with age are worth mentioning. Visual confrontation naming, or the ability to see a common object and name it, remains about the same until age 70, and then declines in subsequent years. Verbal fluency, which is the ability to perform a word search and generate words for a certain category (e.g., letters, animal names) in a certain amount of time, also shows decline with aging.
3. Visuospatial Abilities/construction:
The comprehension of two and three dimensions of space falls under this category of cognitive abilities. The capacity to assemble separate pieces into a cohesive whole—like constructing furniture from a package of parts—as well as visual construction skills deteriorate with age.Visuospatial abilities, on the other hand, do not change. These skills include object perception, which is the capacity to identify well-known objects like faces or household items, and spatial perception, which is the capacity to understand an object’s precise placement on its own or in relation to other objects.
4. Executive Functioning:
The abilities that enable an individual to successfully participate in autonomous, acceptable, purposeful, and self-serving action are referred to as executive functioning. This covers a broad spectrum of cognitive skills, including the capacity for self-awareness, organization, planning, reasoning, mental flexibility, and problem-solving. Because older persons tend to think more concretely than younger adults, research has shown that concept development, abstraction, and mental flexibility deteriorate with age, especially around age 70. The capacity to suppress an instinctive reaction in favor of coming up with a creative one is known as response inhibition, and it is adversely impacted by aging.Executive functions that depend on a faster motor component are especially vulnerable to the effects of aging.
5. Memory:
Memory changes are among the most prevalent cognitive problems among the older population. In fact, on a number of learning and memory tests, older persons do not perform as well as younger adults combined. Age-related memory declines may be caused by slower processing speeds, a diminished capacity to filter out unnecessary information, and a decline in the application of learning and memory-enhancing techniques.
Reasons of cognitive decline in older Adults
Problems pertaining to memory, cognition, or other brain functions can have multiple underlying causes. Among the most typical reasons why older persons experience cognitive deterioration are:
1) Medications
Medications that interfere with normal brain function most frequently are sedatives, tranquilizers, and anticholinergics. Anticholinergic medications block the neurotransmitter, which is a substance that nerve cells release to communicate with other cells. This may have an impact on learning and memory in the brain as well as physical muscle contractions.
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2) Blood Composition
Different blood chemistry imbalances brought on by kidney or liver failure might occasionally impact brain function. Unusual blood chemistry can also lead to cognitive loss if it contains abnormal quantities of calcium, glucose, or sodium.
3) Problems with hormones
Estrogen and other sex hormone imbalances may affect how well the brain function
4) Inadequate intake of vitamins
Brain function is frequently impacted by low amounts of folate, vitamin B12, and other B vitamins.
Reference+
- https://bpac.org.nz/2020/cognitive.aspx
- https://www.sciencedirect.com/topics/medicine-and-dentistry/cognitive-aging
- https://www.webmd.com/alzheimers/ss/slideshow-is-it-aging-or-alzheimers
- https://www.ncbi.nlm.nih.gov/pmc/articles/
