Cognitive testing — what the tests measure and what the scores mean

This article is for educational purposes only and does not constitute medical, legal, or financial advice. Every family situation is different, and you should consult with appropriate professionals about your specific circumstances.

Your parent came out of the neurologist's office with a number. A score. Something that's supposed to tell them and you something about their brain. They drew clocks and recited words and someone asked them what the president's name was and whether they knew what year it is. And now there's a number, and that number is being used to make decisions about their health, their independence, maybe even their future.

You want to trust the number. Numbers feel objective. Numbers feel like facts. But cognitive tests are not like blood tests or imaging. They're measuring something much more slippery. They're measuring performance on a particular task on a particular day with a particular person administering the test. Your parent was tired that day. Or they were nervous. Or they'd been thinking about something else and it took them a moment to focus. Or they had to concentrate hard because they were in an unfamiliar office with an unfamiliar person. All of that affects the score.

This article is about what cognitive tests actually measure, what they genuinely tell you, what they miss, and how to interpret them in a way that's actually useful instead of just scary.

What Cognitive Tests Actually Are

Cognitive testing isn't a brain scan or a blood draw. It's a person asking your parent to do things. The things are designed to be simple enough that a person with normal cognitive function would have no trouble doing them, but hard enough that deficits would show up.

One common test is the Mini-Cog. Your parent might be asked to repeat three words back immediately. Then they draw a clock. Then they try to recall the three words. That's it. Maybe ninety seconds total. The test takes almost no time, but it's designed to catch major cognitive problems.

Another test is the Montreal Cognitive Assessment. This one is more comprehensive. Your parent might be asked to identify animals in pictures. Repeat words. Remember a list of words that they'll be asked about later. Do some basic arithmetic or copy a pattern. Draw a clock. Remember the words from earlier. Tell you the date and the day of the week. The test takes about ten to fifteen minutes. It's checking memory, attention, language, visual-spatial skills, and executive function.

The Mini-Cog is looking for severe cognitive impairment. The MoCA is looking for milder changes. There are other tests too. The MMSE, the SLUMS, the TYM, all with slightly different focuses and lengths and difficulty levels.

Clock drawing is in many of these tests, and it shows up so much because it's a weird test that seems simple but actually requires a lot of your brain. To draw a clock, you have to understand what a clock is, where the numbers go, what the hands do, you have to have spatial reasoning, you have to have executive function to plan how to fit it on the page, you have to have motor control to actually draw it. If someone draws a clock that's way off, that tells the doctor something. But if someone draws a clock that looks mostly right, is that normal or not? Some doctors score it this way, some that way.

Word recall is in most tests. The person is read a list of words. They repeat them back immediately. Then they're asked to remember them later. How many did they remember? The idea is that memory problems show up when someone can't recall words they heard five minutes ago.

But here's where it gets tricky. Some people are terrible at remembering arbitrary lists of words they've only heard once, and they always have been, even when they were young. Some people are great at it because they naturally encode information that way. Some people are bad at it because they're anxious during testing and anxiety interferes with memory. Some people are bad at it because they don't hear well and they didn't actually register the words in the first place.

Attention tests might include something like asking someone to count backward from one hundred by sevens. Or to spell WORLD backward. These are quick tests of whether someone can focus and whether they can do mental calculations. But someone who's never been good at mental math is going to struggle, even if their cognition is normal. Someone who's anxious is probably going to mess this up. Someone who has tremors might get frustrated trying to do something that requires fine coordination of thought.

Language testing might involve naming objects from pictures. Repeating sentences. Defining words. Understanding the meaning of passages. These tests catch problems with language, but they also catch hearing problems, fatigue, and not caring much about the test.

The tests are brief. That's partly by design, because you can't spend an hour on screening. But it's also a limitation. Your parent's actual cognition might be much more complex and multifaceted than what shows up in fifteen minutes of testing. Someone might do fine on a cognitive test and still have real problems with complex decision-making in their actual life. Someone might do poorly on a cognitive test and still function okay day-to-day because they've developed workarounds.

What They Measure

Despite the limitations, cognitive tests do measure something real. They measure whether someone's brain is working at a level that's expected for their age and education. They're screening tools, not diagnostic tools. A abnormal score suggests that something is going on. A normal score suggests that nothing major is going on, though it doesn't rule out subtle problems.

Memory is what most of these tests check first. Can your parent remember something they were told five minutes ago? Can they remember the major events of their life? Do they know personal information about themselves? Memory is important because memory loss is one of the most common complaints in people who are developing cognitive decline.

But memory is also complicated. There's short-term memory, which is working memory, the ability to hold information in mind for a short time. There's long-term memory, which is memories from your past. There's the difference between recall, where you have to generate the information from scratch, and recognition, where you see something and you know whether you've seen it before. A person could be terrible at recalling words from a list but fine at recognizing them if you give them options. They could be terrible at recalling what you told them yesterday but fine at remembering major life events.

Attention is another thing tests measure. Can your parent focus? Can they sustain focus? Do they get distracted easily? Attention problems can look like memory problems because if you're not paying attention, you won't remember things. But the underlying problem is different.

Language is another area tested. Can your parent find the words they need? Can they understand what's being said to them? Can they follow complex instructions? Can they repeat things back? Language problems might suggest damage to specific language areas of the brain.

Executive function is more abstract but also important. Can your parent plan ahead? Can they problem-solve? Can they shift between different tasks? Can they inhibit impulses? Clock drawing is checking executive function. So is counting backward by sevens. So is asking someone how they would handle a particular situation.

Spatial reasoning is checked by asking people to copy patterns or drawings or to identify objects or work through in their minds. Someone might say, if you're facing north and you turn right, which direction are you facing? That's spatial reasoning.

The tests are trying to figure out whether your parent's brain is working the way it should. They're measuring general cognitive ability, not specific knowledge. Your parent could be terrible at cognitive testing and still know more about history or gardening or whatever their expertise is than anyone around them. The tests aren't measuring knowledge. They're measuring the machinery of thinking.

What They Miss

Cognitive testing happens in a particular setting. Your parent is in an office. There's a person asking them questions. There's usually quiet. There's usually control. That's not how your parent's life actually works. Your parent's actual life is noisy and complicated and full of distractions and competing demands. Someone who can do fine on a cognitive test in a quiet office might struggle tremendously with managing complex tasks in the real world where there's noise and interruptions and things that aren't on the test.

Testing also misses the social and emotional aspects of cognition. Your parent might be able to name objects and remember words but be terrible at understanding social cues. They might be able to pass all the memory tests but be unable to understand why a particular joke is funny or why their comment hurt someone's feelings. These are important parts of thinking, but they're not on a clock drawing test.

Tests miss the effect of compensatory strategies. Your parent might get a test score that suggests they have significant memory problems. But in real life, they've developed the strategy of writing everything down. They have systems. They have routines. They've adjusted their life in ways that make it work despite the memory problems. The test catches the problem but misses the solution.

Tests miss good days versus bad days. Your parent might be tested on a day when they're rested and feeling well. Or they might be tested on a day when they're tired or anxious or dealing with pain. Same person, same cognition, but different performance.

Tests miss the contribution of things that aren't cognition. Depression can make it hard to concentrate during a test. Anxiety can interfere with memory. Pain can make it hard to focus. Hearing loss can make it hard to understand questions. Vision problems can affect tasks that require seeing. Sleep deprivation affects performance. A urinary tract infection affects cognition. All of these things can make someone do worse on a cognitive test without changing their actual brain structure or underlying cognition.

Tests miss the specific kinds of problems that matter for an individual person's life. You might care about whether your parent can still manage their finances. The cognitive test doesn't have a question about whether they can balance a checkbook or compare prices. The test might catch a memory problem, but it doesn't tell you whether that memory problem affects their ability to manage their life in the way you care about.

Tests miss the difference between a person who's slow and thoughtful and a person who's actually impaired. The test is timed sometimes. Your parent takes longer because they're being careful, not because they can't do it. The test marks them wrong or marks them down and that shows up as a lower score. But that's not really a problem. That's just personality.

Tests also miss the beginning of decline sometimes. There's a thing called cognitive reserve where some people have so much cognitive ability to start with that they have to lose quite a bit before it shows up on a test. Someone who was highly educated and spent their whole career doing complex work might have a lot of cognitive reserve. They could be declining and not show it on a screening test because they're still within the normal range, just lower than where they used to be.

The opposite is also true. Someone who didn't have as much education to begin with might get a low score on a cognitive test that doesn't reflect decline. That's just where they are. The test can't tell you if they've changed.

Interpreting the Results

A doctor is supposed to interpret a cognitive test in context. The context is your parent's age, education, and previous level of functioning. The context is whether this score represents a change from the person's baseline. The context is whether the person's performance on the test matches what you see in their daily life. A score of 26 on the MoCA might be normal for someone who's eighty-five and had a high school education. The same score might represent significant decline for someone who's sixty-five and was a college professor.

A normal score doesn't mean your parent doesn't have some cognitive complaints. It means that on the particular test on that particular day, they performed at an expected level. They might still have subjective memory complaints. They might still feel foggier than they used to be. But the test didn't pick it up.

An abnormal score doesn't mean your parent has dementia. It means they performed worse than expected on the test. It suggests that something is going on. It might be dementia. It might be mild cognitive impairment. It might be depression. It might be that they were having a bad day. It might be that they weren't trying hard. It might be something medical that's affecting their cognition.

The score is a data point, not a verdict. It's information. But information always requires interpretation.

If your parent gets a score that concerns you or their doctor, the next step usually isn't to panic. The next step is usually to think about what else might be contributing. Have they been sleeping well? Are they dealing with an infection? Are they on any new medications? How are they actually functioning at home? Do they seem to be declining or is this new? Are they anxious during the test?

The doctor might want to repeat the testing in a few months to see if there's a pattern. They might want imaging to see if there's something visible in the brain. They might want to do more comprehensive testing. They might want to treat something medical that could be affecting cognition and then retest.

After the Test

After your parent has been cognitively tested, you have some information. That information is useful. But it's not the whole story. A score tells you how your parent performed on that test. It doesn't tell you everything you need to know about their cognition. It doesn't tell you whether they'll stay stable or decline. It doesn't tell you what's causing any problems that were found. It doesn't tell you what they can or can't do in the real world.

What the test does do is give you and your parent and the doctor a starting point for a conversation. If the score suggests problems, you can talk about what those problems mean for daily life. You can talk about what's causing them. You can talk about what to do about it. If the score is normal but your parent is still having subjective complaints, you can talk about why that might be.

The score is a snapshot. It's one moment. Your parent's cognition is a movie. You need to watch over time to see if there's a pattern. You need to watch in different settings. You need to pay attention to how they're actually doing, not just what a number says.

Some people get obsessed with their cognitive test scores. They want to do it again and again to see if the number's going up or down. They want to do brain training games to try to improve their score. They want to know exactly where they stand. This makes sense, but it can also be counterproductive. It focuses attention on the test instead of on actual functioning. It can create anxiety. It can make the person feel like their cognition is more fragile than it is.

A better approach is to get tested periodically as recommended by your doctor. Usually that means if there's a concern, get tested. If it's normal, maybe retest in a year to see if there's been change. But don't make the test the center of the story. The test is information. How your parent is actually living is the story.

How To Help Your Elders is an educational resource. We do not provide medical, legal, or financial advice. The information in this article is general in nature and may not apply to your specific situation. If you are concerned about a loved one's cognitive health or safety, consult with their healthcare provider or contact your local Area Agency on Aging for guidance and support.