Think you’re good at multi-tasking? Here’s how your brain compensates – and how this changes with age
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We’re all time-poor, so multi-tasking is seen as a necessity of modern living. We answer work emails while watching TV, make shopping lists in meetings and listen to podcasts when doing the dishes. We attempt to split our attention countless times a day when juggling both mundane and important tasks.
But doing two things at the same time isn’t always as productive or safe as focusing on one thing at a time.
The dilemma with multi-tasking is that when tasks become complex or energy-demanding, like driving a car while talking on the phone, our performance often drops on one or both.
Here’s why – and how our ability to multi-task changes as we age.
Doing more things, but less effectively
The issue with multi-tasking at a brain level, is that two tasks performed at the same time often compete for common neural pathways – like two intersecting streams of traffic on a road.
In particular, the brain’s planning centres in the frontal cortex (and connections to parieto-cerebellar system, among others) are needed for both motor and cognitive tasks. The more tasks rely on the same sensory system, like vision, the greater the interference.
This is why multi-tasking, such as talking on the phone, while driving can be risky. It takes longer to react to critical events, such as a car braking suddenly, and you have a higher risk of missing critical signals, such as a red light.
The more involved the phone conversation, the higher the accident risk, even when talking “hands-free”.
Generally, the more skilled you are on a primary motor task, the better able you are to juggle another task at the same time. Skilled surgeons, for example, can multitask more effectively than residents, which is reassuring in a busy operating suite.
Highly automated skills and efficient brain processes mean greater flexibility when multi-tasking.
Adults are better at multi-tasking than kids
Both brain capacity and experience endow adults with a greater capacity for multi-tasking compared with children.
You may have noticed that when you start thinking about a problem, you walk more slowly, and sometimes to a standstill if deep in thought. The ability to walk and think at the same time gets better over childhood and adolescence, as do other types of multi-tasking.
When children do these two things at once, their walking speed and smoothness both wane, particularly when also doing a memory task (like recalling a sequence of numbers), verbal fluency task (like naming animals) or a fine-motor task (like buttoning up a shirt). Alternately, outside the lab, the cognitive task might fall by wayside as the motor goal takes precedence.
Brain maturation has a lot to do with these age differences. A larger prefrontal cortex helps share cognitive resources between tasks, thereby reducing the costs. This means better capacity to maintain performance at or near single-task levels.
The white matter tract that connects our two hemispheres (the corpus callosum) also takes a long time to fully mature, placing limits on how well children can walk around and do manual tasks (like texting on a phone) together.
For a child or adult with motor skill difficulties, or developmental coordination disorder, multi-tastking errors are more common. Simply standing still while solving a visual task (like judging which of two lines is longer) is hard. When walking, it takes much longer to complete a path if it also involves cognitive effort along the way. So you can imagine how difficult walking to school could be.
What about as we approach older age?
Older adults are more prone to multi-tasking errors. When walking, for example, adding another task generally means older adults walk much slower and with less fluid movement than younger adults.
These age differences are even more pronounced when obstacles must be avoided or the path is winding or uneven.
Older adults tend to enlist more of their prefrontal cortex when walking and, especially, when multi-tasking. This creates more interference when the same brain networks are also enlisted to perform a cognitive task.
These age differences in performance of multi-tasking might be more “compensatory” than anything else, allowing older adults more time and safety when negotiating events around them.
Older people can practise and improve
Testing multi-tasking capabilities can tell clinicians about an older patient’s risk of future falls better than an assessment of walking alone, even for healthy people living in the community.
Testing can be as simple as asking someone to walk a path while either mentally subtracting by sevens, carrying a cup and saucer, or balancing a ball on a tray.
Patients can then practise and improve these abilities by, for example, pedalling an exercise bike or walking on a treadmill while composing a poem, making a shopping list, or playing a word game.
The goal is for patients to be able to divide their attention more efficiently across two tasks and to ignore distractions, improving speed and balance.
There are times when we do think better when moving
Let’s not forget that a good walk can help unclutter our mind and promote creative thought. And, some research shows walking can improve our ability to search and respond to visual events in the environment.
But often, it’s better to focus on one thing at a time
We often overlook the emotional and energy costs of multi-tasking when time-pressured. In many areas of life – home, work and school – we think it will save us time and energy. But the reality can be different.
Multi-tasking can sometimes sap our reserves and create stress, raising our cortisol levels, especially when we’re time-pressured. If such performance is sustained over long periods, it can leave you feeling fatigued or just plain empty.
Deep thinking is energy demanding by itself and so caution is sometimes warranted when acting at the same time – such as being immersed in deep thought while crossing a busy road, descending steep stairs, using power tools, or climbing a ladder.
So, pick a good time to ask someone a vexed question – perhaps not while they’re cutting vegetables with a sharp knife. Sometimes, it’s better to focus on one thing at a time.
Peter Wilson, Professor of Developmental Psychology, Australian Catholic University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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How & Why Non-Sleep Deep Rest Works (And What Activities Trigger The Same State)
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Stress is a natural response that evolved over thousands of years to help humans meet challenges by priming the body and mind for action. However, chronic stress is harmful, as it diverts energy away from essential processes like cell maintenance and repair, leading to deterioration of health (physical and mental).
Counteracting this requires intentional periods of deep rest… But how?
Parasympathetic Response
Practices as diverse as mindfulness meditation, yoga, prayer, tai chi, qigong, knitting, painting, gardening, and sound baths can help induce states of deep rest—these days often called “Non-Sleep Deep Rest” (NSDR), to differentiate it from deep sleep.
How it works: these activities send signals to the brain that the body is safe, initiating biological changes that…
- protect chromosomes from DNA damage
- promote cellular repair, and
- enhance mitochondrial function.
If we then (reasonably!) conclude from this: “so, we must embrace moments of stillness and mindfulness, and allow ourselves to experience the ease and safety of the present”, that may sound a little wishy-washy, but the neurology of it is clear, the consequences of that neurological response on every living cell in the body are also clear, so by doing NSDR (whether by yoga nidra or knitting or something else) we can significantly improve our overall well-being.
Note: the list of activities above is far from exhaustive, but do be aware that this doesn‘t mean any activity you enjoy and do to unwind will trigger NSDR. On the contrary, many activities you enjoy and do to unwind may trigger the opposite, a sympathetic nervous system response—watching television is a common example of this “wrong choice for NSDR”. Sure, it can be absorbing and a distraction from your daily stressors, but it also can be exciting (both cognitively and neurologically and thus also physiologically), which is the opposite of what we want.
For more on all of this, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
Non-Sleep Deep Rest: A Neurobiologist’s Take
Take care!
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The Collagen Cure – by Dr. James DiNicolantonio
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Collagen is vital for, well, most of our bodies, really. Where me most tend to feel its deficiency is in our joints and skin, but it’s critical for bones and many other tissues too.
You may be wondering: why a 572-page book to say what surely must amount to “take collagen, duh”?
Dr. DiNicolantonio has a lot more of value to offer us than that. In this book, we learn about not just collagen synthesis and usage, different types of collagen, the metabolism of it in our diet (if we get it—vegans and vegetarians won’t). We also learn about the building blocks of collagen (vegans and vegetarians do get these, assuming a healthy balanced diet), with a special focus on glycine, the smallest amino acid which makes up about a third of the mass of collagen (a protein).
Not stopping there, we also learn about the interplay of other nutrients with our metabolism of glycine and, if applicable, collagen. Vitamin C and copper are star features, but there’s a lot more going on with other nutrients too, down to the level of “So take this 75 minutes before this but after that and/but definitely not with the other”, etc.
The style is incredibly clear and readable for something that’s also quite scientifically dense (over 1000 references and many diagrams).
Bottom line: if you’re serious about maintaining your body as you get older, and you’d like a book about collagen that’s a lot more helpful than “take collagen, duh”, then this is the book for you.
Click here to check out The Collagen Cure, and take care of yours!
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What Macronutrient Balance Is Right For You?
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It’s Q&A Day at 10almonds!
Have a question or a request? We love to hear from you!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small 😎
❝I want to learn more about macros. Can you cover that topic?❞
That’s a little broader than we usually go for, given the amount of space we have, but let’s give it a go!
Macronutrients, or “macros”, are the nutrients that we typically measure in grams rather than milligrams or micrograms, and are:
- Carbohydrates
- …and what kinds, of which usually the focus is on how much is sugars as opposed to more complex carbs that take longer to break down. See also: Should You Go Light Or Heavy On Carbs?
- …and of the sugars, the interested may further categorize them into sucrose, fructose, etc. See also: Which Sugars Are Healthier, And Which Are Just The Same?
- Proteins
- …of which, the amino acid make-up is generally considered a matter of micronutrients. See also: Protein: How Much Do We Need, Really?
- Fats
- …and what kinds, i.e. monounsaturated vs polyunsaturated vs saturated. See also: Saturated Fat: What’s The Truth?
- …and then the interested may further categorize them for their fatty acids / triglycerides profile, etc. See also: What Omega-3 Fatty Acids Really Do For Us
- Fiber
- …which often gets ignored by people counting macros, as “stuff that doesn’t do anything”, despite it in fact being very important for health. See also: Why You’re Probably Not Getting Enough Fiber (And How To Fix It)
- Water
- …which again tends to get disregarded but is very arguably a critical macronutrient. See also: Busting The Myth of “Eight Glasses Of Water A Day”
In terms of how much we need of each, you can read more in the above-linked articles, but:
- General scientific consensus is we need plenty of fiber (30 or 40g per day is good) and water (highly dependent on climate and activity), and there’s a clear minimum requisite for protein (usually put at around 1g of protein per day per 1kg of body weight).
- There is vigorous debate in the general health community about what the best ratio of carbs to fat is.
The reality is that humans are quite an adaptable species, and while we absolutely do need at least some of both (carbohydrates and fats), we can play around with the ratios quite a bit, provided we don’t get too extreme about it.
While some influence is social and often centered around weight loss (see for example keto which seeks to minimize carbs, and volumetrics, which seeks maximise volume-to-calorie ratio, which de facto tends to minimize fats), some of what drives us to lean one way or the other will be genetics, too—dependent on what our ancestors ate more or less of.
Writer’s example: my ancestors could not grow much grain (or crops in general) where they were, so they got more energy from such foods as whale and seal fat (with protein coming more from reindeer). Now, biology is not destiny, and I personally enjoy a vegan diet, but my genes are probably why I am driven to get most of my daily calories from fat (of which, a lot of fatty nuts (don’t tell almonds, but I prefer walnuts and cashews) and healthy oils such as olive oil, avocado oil, and coconut oil).
However! About that adaptability. Provided we make changes slowly, we can usually adjust our diet to whatever we want it to be, including whether we get our energy more from carbs or fats. The reason we need to make changes slowly is because our gut needs time to adjust. For example, if your vegan writer here were to eat her ancestrally-favored foods now, I’d be very ill, because my gut microbiome has no idea what to do with animal products anymore, no matter what genes I have. In contrast, if an enthusiastic enjoyer of a meat-heavy diet were to switch to my fiber-rich diet overnight, they’d be very ill.
So: follow your natural inclinations, make any desired changes slowly, and if in doubt, it’s hard to go wrong with enjoying carbs and fats in moderation.
Learn more: Intuitive Eating Might Not Be What You Think
Take care!
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- Carbohydrates
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Optimism Seriously Increases Longevity!
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Always look on the bright side for life
❝I’m not a pessimist; I’m a realist!❞
~ every pessimist ever
To believe self-reports, the world is divided between optimists and realists. But how does your outlook measure up, really?
Below, we’ve included a link to a test, and like most free online tests, this is offered “as-is” with the usual caveats about not being a clinical diagnostic tool, this one actually has a fair amount of scientific weight behind it:
❝Empirical testing has indicated the validity of the Optimism Pessimism Instrument as published in the scientific journal Current Psychology: Research and Reviews.
The IDRlabs Optimism/Pessimism Test (IDR-OPT) was developed by IDRlabs. The IDR-OPT is based on the Optimism/Pessimism Instrument (OPI) developed by Dr. William Dember, Dr. Stephanie Martin, Dr. Mary Hummer, Dr. Steven Howe, and Dr. Richard Melton, at the University of Cincinnati.❞
Take This Short (1–2 mins) Test
How did you score? And what could you do to improve on that score?
We said before that we’d do a main feature on this sometime, and today’s the day! Fits with the theme of Easter too, as for those who observe, this is a time for a celebration of hope, new beginnings, and life stepping out of the shadows.
On which note, before we go any further, let’s look at a very big “why” of optimism…
There have been many studies done regards optimism and health, and they generally come to the same conclusion: optimism is simply good for the health.
Here’s an example. It’s a longitudinal study, and it followed 121,700 women (what a sample size!) for eight years. It controlled for all kinds of other lifestyle factors (especially smoking, drinking, diet, and exercise habits, as well as pre-existing medical conditions), so this wasn’t a case of “people who are healthy are more optimistic as a result. And, in the researchers’ own words…
❝We found strong and statistically significant associations of increasing levels of optimism with decreasing risks of mortality, including mortality due each major cause of death, such as cancer, heart disease, stroke, respiratory disease, and infection.
Importantly, findings were maintained after close control for potential confounding factors, including sociodemographic characteristics and depression❞
Read: Optimism and Cause-Specific Mortality: A Prospective Cohort Study
So that’s the why. Now for the how…
Positive thinking is not what you think it is
A lot of people think of “think positive thoughts” as a very wishy-washy platitude, but positive thinking isn’t about ignoring what’s wrong, or burying every negative emotion.
Rather, it is taking advantage of the basic CBT, DBT, and, for that matter, NLP principles:
- Our feelings are driven by our thoughts
- Our thoughts can be changed by how we frame things
This is a lot like the idea that “there’s not such thing as bad weather; only the wrong clothes”. Clearly written by someone who’s never been in a hurricane, but by and large, the principle stands true.
For example…
- Most problems can be reframed as opportunities
- Replace “I have to…” with “I get to…”
- Will the task be arduous? It’ll be all the better looking back on it.
- Did you fail abjectly? Be proud that you lived true to your values anyway.
A lot of this is about focusing on what you can control. If you live your life by your values (first figure out what they are, if you haven’t already), then that will become a reassuring thing that you can always count on, no matter what.
Practice positive self-talk (eliminate the negative)
We often learn, usually as children, to be self deprecatory so as to not appear immodest. While modesty certainly has its place, we don’t have to trash ourselves to do that!
There are various approaches to this, for example:
- Replacing a self-criticism (whether it was true or not) with a neutral or positive statement that you know is true. “I suck at xyz” is just putting yourself down, “Xyz is a challenge for me” asks the question, how will you rise to it?
- Replacing a self-criticism with irony. It doesn’t matter how dripping with sarcasm your inner voice is, the words will still be better. “Glamorous as ever!” after accidentally putting mascara in your eye. “So elegant and graceful!” after walking into furniture. And so on.
Practice radical acceptance
This evokes the “optimistic nihilism” approach to life. It’s perhaps not best in all scenarios, but if you’re consciously and rationally pretty sure something is going to be terrible (and/or know it’s completely outside of your control), acknowledging that possibility (or even, likelihood) cheerfully. Borrowing from the last tip, this can be done with as much irony as you find necessary. For example:
Facing a surgery the recovery from which you know categorically will be very painful: with a big smile “Yep, I am going to be in a lot of pain, so that’s going to be fun!” (fun fact: psychological misery will not make the physical pain any less painful, so you might as well see the funny side) ← see link for additional benefits laughter can add to health-related quality of life)
Plan for the future with love
You know the whole “planting trees in whose shade you’ll never sit”, thing, but: actually for yourself too. Plan (and act!) now, out of love and compassion for your future self.
Simple example: preparing (or semi-preparing, if appropriate) breakfast for yourself the night before, when you know in the morning you’ll be tired, hungry, and/or pressed for time. You’ll wake up, remember that you did that, and…
Tip: at moments like that, take a moment to think “Thanks, past me”. (Or call yourself by your name, whatever works for you. For example I, your writer here, might say to myself “Thanks, past Nastja!”)
This helps to build a habit of gratitude for your past self and love for your future self.
This goes for little things like the above, but it also goes for things whereby there’s much longer-term delayed gratification, such as:
- Healthy lifestyle changes (usually these see slow, cumulative progress)
- Good financial strategies (usually these see slow, cumulative progress)
- Long educational courses (usually these see slow, cumulative progress)
Basically: pay it forward to your future self, and thank yourself later!
Some quick ideas of systems and apps that go hard on the “long slow cumulative progress” approach that you can look back on with pride:
- Noom—nutritional program with a psychology-based approach to help you attain and maintain your goals, long term
- You Need A Budget—we’ve recommended it before and we’ll recommend it again. This is so good. If you click through, you can see a short explanation of what makes it so different to other budgeting apps.
- Duolingo—the famously persistence-motivational language learning app
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Olive oil is healthy. Turns out olive leaf extract may be good for us too
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Olive oil is synonymous with the Mediterranean diet, and the health benefits of both are well documented.
Olive oil reduces the risk of heart disease, cancer, diabetes and premature death. Olives also contain numerous healthy nutrients.
Now evidence is mounting about the health benefits of olive leaves, including from studies in a recent review.
Here’s what’s in olive leaves and who might benefit from taking olive leaf extract.
mtphoto19/Shutterstock What’s in olive leaves?
Olive leaves have traditionally been brewed as a tea in the Mediterranean and drunk to treat fever and malaria.
The leaves contain high levels of a type of antioxidant called oleuropein. Olives and olive oil contain this too, but at lower levels.
Generally, the greener the leaf (the less yellowish) the more oleuropein it contains. Leaves picked in spring also have higher levels compared to ones picked in autumn, indicating levels of oleuropein reduce as the leaves get older.
Olive leaves also contain other antioxidants such as hydroxytyrosol, luteolin, apigenin and verbascoside.
Antioxidants work by reducing the oxidative stress in the body. Oxidative stress causes damage to our DNA, cell membranes and tissues, which can lead to chronic diseases such as cancer and heart disease.
Are olive leaves healthy?
One review and analysis combined data from 12 experimental studies with 819 participants in total. Overall, olive leaf extract improved risk factors for heart disease. This included healthier blood lipids (fats) and lowering blood pressure.
The effect was greater for people who already had high blood pressure.
Most studies in this review gave olive leaf extract as a capsule, with daily doses of 500 milligrams to 5 grams for six to 48 weeks.
Another review and analysis published late last year looked at data from 12 experimental studies, with a total of 703 people. Some of these studies involved people with high blood lipids, people with high blood pressure, people who were overweight or obese, and some involved healthy people.
Daily doses were 250-1,000mg taken as tablets or baked into bread.
Individual studies in the review showed significant benefits in improving blood glucose (sugar) control, blood lipid levels and reducing blood pressure. But when all the data was combined, there were no significant health effects. We’ll explain why this may be the case shortly.
Olive leaves can be brewed into tea. Picture Partners/Shutterstock Another review looked at people who took oleuropein and hydroxytyrosol (the antioxidants in olive leaves). This found significant improvement in body weight, blood lipid profiles, glucose metabolism and improvements in bones, joints and cognitive function.
The individual studies included tested either the two antioxidants or olive leaf incorporated into foods such as bread and cooking oils (but not olive oil). The doses were 6-500mg per day of olive leaf extract.
So what can we make of these studies overall? They show olive leaf extract may help reduce blood pressure, improve blood lipids and help our bodies handle glucose.
But these studies show inconsistent results. This is likely due to differences in the way people took olive leaf extract, how much they took and how long for. This type of inconsistency normally tells us we need some more research to clarify the health effects of olive leaves.
Can you eat olive leaves?
Olive leaves can be brewed into a tea, or the leaves added to salads. Others report grinding olive leaves into smoothies.
However the leaves are bitter, because of the antioxidants, which can make them hard to eat, or the tea unpalatable.
Olive leaf extract has also been added to bread and other baked goods. Researchers find this improves the level of antioxidants in these products and people say the foods tasted better.
Olive leaves can taste bitter, which can put people off. But you can bake the extract into bread. Repina Valeriya/Shutterstock Is olive leaf extract toxic?
No, there seem to be no reported toxic effects of eating or drinking olive leaf extract.
It appears safe up to 1g a day, according to studies that have used olive leaf extract. However, there are no official guidelines about how much is safe to consume.
There have been reports of potential toxicity if taken over 85mg/kg of body weight per day. For an 80kg adult, this would mean 6.8g a day, well above the dose used in the studies mentioned in this article.
Pregnant and breastfeeding women are recommended not to consume it as we don’t know if it’s safe for them.
What should I do?
If you have high blood pressure, diabetes or raised blood lipids you may see some benefit from taking olive leaf extract. But it is important you discuss this with your doctor first and not change any medications or start taking olive leaf extract until you have spoken to them.
But there are plenty of antioxidants in all plant foods, and you should try to eat a wide variety of different coloured plant foods. This will allow you to get a range of nutrients and antioxidants.
Olive leaf and its extract is not going to be a panacea for your health if you’re not eating a healthy diet and following other health advice.
Evangeline Mantzioris, Program Director of Nutrition and Food Sciences, Accredited Practising Dietitian, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Cardiac Failure Explained – by Dr. Warrick Bishop
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The cover of this book makes it look like it’ll be a flashy semi-celebrity doctor keen to sell his personalized protocol, along with eleventy-three other books, but actually, what’s inside this one is very different:
We (hopefully) all know the basics of heart health, but this book takes it a lot further. Starting with the basics, then the things that it’s easy to feel like you should know but actually most people don’t, then into much more depth.
The format is much more like a university textbook than most pop-science books, and everything about the way it’s written is geared for maximum learning. The one thing it does keep in common with pop-science books as a genre is heavy use of anecdotes to illustrate points—but he’s just as likely to use tables, diagrams, callout boxes, emboldening of key points, recap sections, and so forth. And for the most part, this book is very information-dense.
Dr. Bishop also doesn’t just stick to what’s average, and talks a lot about aberrations from the norm, what they mean and what they do and yes, what to do about them.
On the one hand, it’s more information dense than the average reader can reasonably expect to need… On the other hand, isn’t it great to finish reading a book feeling like you just did a semester at medical school? No longer will you be baffled by what is going on in your (or perhaps a loved one’s) cardiac health.
Bottom line: if you’d like to know cardiac health inside out, this book is an excellent place to start.
Click here to check out Cardiac Failure Explained, and get to the heart of things!
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