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To Improve Your Brain, Exercise Your Body

January 15, 2016 by Joycelyn Campbell Leave a Comment

Sitting in front of a computer screen to play brain games is not the best way to enhance or maintain your cognitive abilities. First of all it doesn’t really work. And second, it involves sitting. Standing is only marginally better. (And playing brain games on a portable electronic device while walking is just an accident waiting to happen.)

As John Medina writes in Brain Rules:

The brain appears to be designed to (1) solve problems (2) related to surviving (3) in an unstable outdoor environment, and (4) to do so in nearly constant motion.

The links between physical exercise and brain health have been getting a lot of attention lately. Here are summaries of some of the research with links to the articles (click on the titles). The last two of these studies were included in my post last fall on Five Ways to Improve Your Brain; the first three are more recent.

Get Moving

A neuroscientist (Wendy A. Suzuki) says there are powerful benefits to exercise that are rarely discussed.

When I was about to turn 40, I started working out regularly after years of inactivity. As I sweated my way through cardio, weights, and dance classes, I noticed that exercise wasn’t just changing my body. It was also profoundly transforming my brain—for the better.

The immediate effects of exercise on my mood and thought process proved to be a powerful motivational tool. And as a neuroscientist and workout devotee, I’ve come to believe that these neurological benefits could have profound implications for how we live, learn and age as a society.

Exercise combats stress.
Increased levels of physical exercise can result in improved memory
Exercise improves our ability to shift and focus attention.
Exercise could help students better absorb everything from history lessons to chemistry experiments–and they’d be happier too.
Exercise could make students more imaginative at school and adults more creative at work.
The longer and more regularly you exercise through your life, the lower your chances are of suffering from cognitive decline and dementia as you age.

Do… build your body

We often make a distinction between brains and brawn. In fact, getting in shape is one of the surest ways to build your mind. Physical activity not only establishes a better blood flow to the brain; it also triggers a surge of proteins such as “nerve growth factor” that can help stimulate the growth and maintenance of neural connections in the brain.

The benefits seem to stretch from cradle to grave: children who walk to school get better grades, while taking a leisurely stroll seemed to boost pensioner’s concentration and memory. What’s more, a wide variety of exercises can help, from gentle aerobic exercise to weight training and body building; just choose a training regime that suits your current fitness.

Study suggests physical activity makes it easier for the brain to change

Learning, memory, and brain repair depend on the ability of our neurons to change with experience. Now, researchers reporting in the Cell Press journal Current Biology on December 7 have evidence from a small study in people that exercise may enhance this essential plasticity of the adult brain.

The findings focused on the visual cortex come as hopeful news for people with conditions including amblyopia (sometimes called lazy eye), traumatic brain injury, and more, the researchers say.

“We provide the first demonstration that moderate levels of physical activity enhance neuroplasticity in the visual cortex of adult humans,” says Claudia Lunghi of the University of Pisa in Italy.

“By showing that moderate levels of physical activity can boost the plastic potential of the adult visual cortex, our results pave the way to the development of non-invasive therapeutic strategies exploiting the intrinsic brain plasticity in adult subjects,” she adds.

While further study is needed, the researchers think that this effect may result from a decrease with exercise in an inhibitory neurotransmitter called GABA. As concentrations of this inhibitory nerve messenger decline, the brain becomes more responsive.

Regardless of the mechanism, the findings suggest that exercise plays an important role in brain health and recovery. They come as especially good news for people with amblyopia, which is generally considered to be untreatable in adults.

“Our study suggests that physical activity, which is also beneficial for the general health of the patient, could be used to increase the efficiency of the treatment in adult patients,” Lunghi says.

Lifting weights, twice a week, may aid the brain

Most studies of exercise and brain health have focused on the effects of running, walking or other aerobic activities. A few encouraging past studies have suggested that regular, moderate aerobic exercise such as walking may slow the progression of white matter lesions in older people.

But Teresa Liu-Ambrose, a professor of physical therapy and director of the Aging, Mobility, and Cognitive Neuroscience Laboratory at the University of British Columbia in Vancouver, wondered whether other types of exercise would likewise be beneficial for white matter. In particular, she was interested in weight training, because weight training strengthens and builds muscles.

After a year-long study, women aged 65-75 who had lifted weights twice per week displayed significantly less shrinkage and tattering of their white matter than the other women. Their lesions had grown and multiplied somewhat, but not nearly as much. They also walked more quickly and smoothly than the women in the other two groups.

Note that the result was only achieved in the group who lifted weights twice per week, not in a group who lifted only once a week.

Regular exercise changes the brain to improve memory, thinking skills

In a study done at the University of British Columbia, researchers found that regular aerobic exercise, the kind that gets your heart and your sweat glands pumping, appears to boost the size of the hippocampus, the brain area involved in verbal memory and learning. Resistance training, balance and muscle toning exercises did not have the same results.

Many studies have suggested that the parts of the brain that control thinking and memory (the prefrontal cortex and medial temporal cortex) have greater volume in people who exercise versus people who don’t. “Even more exciting is the finding that engaging in a program of regular exercise of moderate intensity over six months or a year is associated with an increase in the volume of selected brain regions,” says Dr. Scott McGinnis, a neurologist at Brigham and Women’s Hospital and an instructor in neurology at Harvard Medical School.

How much exercise is required? The study participants walked briskly for one hour, twice a week. That’s 120 minutes of moderate intensity exercise a week. Standard recommendations advise half an hour of moderate physical activity most days of the week, or 150 minutes a week. If that seems daunting, start with a few minutes a day, and increase the amount you exercise by five or 10 minutes every week until you reach your goal.

If you don’t want to walk, consider other moderate-intensity exercises, such as swimming, stair climbing, tennis, squash, or dancing. Don’t forget that household activities can count as well, such as intense floor mopping, raking leaves, or anything that gets your heart pumping so much that you break out in a light sweat.

The Seductive Lure of Online Brain Games

January 8, 2016 by Joycelyn Campbell Leave a Comment

You may have heard that Lumosity has agreed to settle with the Federal Trade Commission to the tune of $2 million in response to charges of deceptive advertising:

The FTC alleges that the defendants claimed training with Lumosity would 1) improve performance on everyday tasks, in school, at work, and in athletics; 2) delay age-related cognitive decline and protect against mild cognitive impairment, dementia, and Alzheimer’s disease; and 3) reduce cognitive impairment associated with health conditions, including stroke, traumatic brain injury, PTSD, ADHD, the side effects of chemotherapy, and Turner syndrome, and that scientific studies proved these benefits.

This didn’t surprise me since I’ve been following various researchers’ attempts to substantiate the many claims made by such companies. I was also aware that in 2014, a group of 70 cognitive scientists and neuroscientists issued a statement warning consumers of the hype over brain games:

We object to the claim that brain games offer consumers a scientifically grounded avenue to reduce or reverse cognitive decline when there is no compelling scientific evidence to date that they do. The promise of a magic bullet detracts from the best evidence to date, which is that cognitive health in old age reflects the long-term effects of healthy, engaged lifestyles. In the judgment of the signatories below, exaggerated and misleading claims exploit the anxieties of older adults about impending cognitive decline. We encourage continued careful research and validation in this field.

A large percentage of the population is concerned about cognitive decline. And they’re willing to pay for what appears to be an easy and even enjoyable quick fix. Quick fixes have become increasingly desirable in the internet age, so the concept of using your electronic device to play games devised by someone else to keep your brain in top form is brilliant marketing, if nothing else. It’s a mini, no-stress, workout for your brain.

The jury is still out as to whether brain games offer any long-term effectiveness. One thing that is known is that improving your performance in a particular game leads to improved performance in that particular game. In that regard, computerized games are no different from playing Scrabble or working crossword or Sudoku puzzles. The more crossword puzzles you work, the better you get at working crossword puzzles. The more Sudoku puzzles you complete, the easier the “challenging” puzzles become. That’s just how the brain works. The more often you attempt any task, the quicker and easier it is to do it. Practice may not make perfect but it definitely makes better.

According to David Z. Hambrick, associate professor of psychology at Michigan State University:

[I]f you find that people get better in one test of reasoning, it doesn’t necessarily mean that they’re smart; it means they’re better on one test of reasoning.

In fact, there’s some indication that just playing video games is better than so-called brain games at improving short-term memory capacity and reasoning.

If you like the experience of playing—and getting better at—computerized brain games (and paying for the pleasure), then go ahead and continue doing it. But computerized brain games are unlikely to have any far-reaching or long-term effects on your cognitive abilities.

And, as an article in Scientific American points out, they take up time that could be put to better use. I’ve been saying for some time now that the two things you can do to grow new neurons and increase the number of synaptic connections in your brain (thus expanding your mental model and your cognitive abilities) are:

Move! Engage in physical exercise.
Learn! Study something new and challenging.

That’s it. Do those two things every day and you will not only be doing something effective to forestall cognitive decline, you will also become healthier and potentially even higher-functioning than you already are.

Five Ways to Improve Your Brain

October 23, 2015 by Joycelyn Campbell 2 Comments

You probably take steps to maintain your physical health, but you may not know that you can also take steps to improve your brain and maintain its health. Promising new research suggests that a number of things that are good for our overall physical health are especially important for the health of our brain. Based on these findings, five things you can do for your brain are:

1. Eat less meat.
2. Lift weights at least two times a week.
3. Include foods with probiotics in your diet.
4. Get regular aerobic exercise.
5. Don’t skimp on sleep.

Here are links to articles reporting the results of the studies. Click on the titles to read the full stories.

1. Could A Mediterranean Diet Keep Your Brain From Shrinking?

Previous research has connected a Mediterranean diet to a reduced risk of developing Alzheimer’s disease and other degenerative brain conditions. In a recent study, researchers focused on elderly people with normal cognitive function to see if the diet might also be tied to losing fewer brain cells due to aging.

“Among cognitively healthy older adults, we were able to detect an association between higher adherence to a Mediterranean type diet and better brain measures,” according to lead study author Yian Gu of Columbia University in New York.

Higher fish intake and lower meat consumption, one aspect of a Mediterranean diet, was tied to larger total gray matter volume on the brain scans.

Eating less meat was also independently associated with larger total brain volume.

Overall, the difference in brain volume between the people who followed a Mediterranean diet and those who didn’t was similar to the effect of five years of aging, the researchers conclude in the journal Neurology.

2. Lifting Weights, Twice a Week, May Aid the Brain

Note that the result was only achieved in the group who lifted weights twice per week, not in a group who lifted only once a week.

3. Probiotics on the Brain

A growing number of scientists now believe that gut bacterial can influence mental health.

The idea that microbes in the body can affect the brain has gone in and out of fashion. In 1896, physicians writing in Scientific American concluded, in the language of the day, that “certain forms of insanity” could be caused by infectious agents “similar to typhoid, diphtheria and others.” But after Freudian psychoanalysis became popular in the first half of the 20th century, the microbial theory of mental illness was largely forgotten, and stayed that way for decades.

Today, however, scientists know that trillions of micro-organisms live in your digestive system, where they outnumber your human cells many times over and may make up as much as 3 percent of your body weight. The evidence that these bacteria affect a dense network of neurons in your gut — often called the “second brain”— is vast and growing.

It’s unclear exactly how or which bacteria cause or cure which disorders and in what complex ways, Dr. James Greenblatt, a psychiatrist and the chief medical officer of Walden Behavioral Care, says, “but the research is quite clear that the GI tract affects brain health.” In this case, he says, “one plus one does equal two.”

4. Regular Exercise Changes the Brain to Improve Memory, Thinking Skills

5. Good Night. Sleep Clean.

Sleep, it turns out, may play a crucial role in our brain’s physiological maintenance. As your body sleeps, your brain is quite actively playing the part of mental janitor: It’s clearing out all of the junk that has accumulated as a result of your daily thinking.

Recall what happens to your body during exercise. You start off full of energy, but soon enough your breathing turns uneven, your muscles tire, and your stamina runs its course. What’s happening internally is that your body isn’t able to deliver oxygen quickly enough to each muscle that needs it and instead creates needed energy anaerobically. And while that process allows you to keep on going, aside effect is the accumulation of toxic byproducts in your muscle cells. Those byproducts are cleared out by the body’s lymphatic system, allowing you to resume normal function without any permanent damage.

The lymphatic system serves as the body’s custodian: Whenever waste is formed, it sweeps it clean. The brain, however, is outside its reach — despite the fact that your brain uses up about 20 percent of your body’s energy. How, then, does its waste — like beta-amyloid, a protein associated with Alzheimer’s disease — get cleared? What happens to all the wrappers and leftovers that litter the room after any mental workout?

“Think about a fish tank,” says Dr. Nedergaard. “If you have a tank and no filter, the fish will eventually die. So, how do the brain cells get rid of their waste? Where is their filter?”

Until a few years ago, the prevailing model was based on recycling: The brain got rid of its own waste, not only beta-amyloid but other metabolites, by breaking it down and recycling it at an individual cell level. When that process eventually failed, the buildup would result in age-related cognitive decline and diseases like Alzheimer’s. That “didn’t make sense” to Dr. Nedergaard, who says that “the brain is too busy to recycle” all of its energy. Instead, she proposed a brain equivalent of the lymphatic system, a network of channels that cleared out toxins with watery cerebrospinal fluid. She called it the glymphatic system, a nod to its dependence on glial cells (the supportive cells in the brain that work largely to maintain homeostasis and protect neurons) and its function as a sort of parallel lymphatic system.

So far the glymphatic system has been identified as the neural housekeeper in baboons, dogs and goats. “If anything,” Dr. Nedergaard says, “it’s more needed in a bigger brain.”

Improve Your Brain–or Lose It?

It’s good news for all of us that there are things we can do to have a positive effect on our brain, from increasing its size to improving cognitive processing to (you should excuse the expression) taking out the trash. Of course, the opposite is also true. Things that we do can have a negative effect on our brain, and that’s not good. But we can’t say we haven’t been warned.

Brain Dead: Is Your Mind Temporarily Offline?

September 4, 2015 by Joycelyn Campbell Leave a Comment

Your brain has two systems for processing the stimuli and experiences of your life and determining how you act upon them.

Conscious: The processing system you’re aware of is called System 2. It is logical and intentional and sometimes referred to as “true reasoning.” (A formal outline is a good example.) It is also slow, limited, and easily depleted. It processes about 40 bits of information at a time.

Unconscious: The processing system you’re not aware of is called System 1. It is associative, which means it sees patterns and connects dots. (A mindmap is a good example.) It is fast, vast, and always on. It processes about 11,000,000 bits of information at a time.

If System 1 were to go offline, you would, too. Game over! But you can still function when System 2 is temporarily offline, even for long periods of time, such as when you’re asleep. So when you think or talk about being temporarily brain dead, you’re talking about exhausting System 2 attention.

If you’re in good health, there’s not much you can do to tax or exhaust the capacity of System 1—and there are things you can do to enhance its functioning. However, your supply of System 2 attention is always limited, and anything that occupies your working memory reduces it. Some examples of things that tax System 2 attention are:

Physical illness (even minor), injury, or lack of sleep
Making numerous trivial decisions throughout the day
Stress, anxiety, and worry
Exercising will power (forcing yourself to do something you don’t want to do or to not do something you do want to do)
Monitoring your behavior
Monitoring your environment if it is new or you consider it unsafe
Learning something new, traveling an unfamiliar route, etc.
Completing a complex computation
Trying to tune out distractions
A long period of concentrated or focused attention
Trying to remember dates, numbers, or unrelated facts
Listening to me talk

Since System 1 is fast, vast, always on, and has an answer for almost everything—and since you don’t need System 2 attention for most of what you do when you’re awake—what’s the big deal if you run out of System 2 attention from time to time?

Three Categories of Errors

Optimally, the two systems work together, and neither type of processing is superior. However, System 1 is more useful in some situations, while System 2 is not only more useful but also required in other situations.

System 1 is pretty good at what it does because its models of familiar situations are accurate so its short-term predictions tend to be accurate. But that’s not always the case. System 1 sacrifices accuracy for speed, meaning it jumps to conclusions. It also has biases and is prone to making logical errors.

One of System 2’s jobs is to detect System 1’s errors and adjust course by overriding System 1’s impulses. As Daniel Kahneman says in Thinking, Fast and Slow:

There are vital tasks that only System 2 can perform because they require effort and acts of self-control in which the intuitions and impulses of System 1 are overcome.

Bear in mind that System 1 is not rational. If System 2 is depleted and can’t veto or modify the non-rational impulses of System 1, those impulses then turn into actions (or speech).

There are three categories of errors you tend to make when System 2 is depleted.

Logical Errors

System 1 thinking uses shortcuts. System 2 thinking takes the long (logical/linear) way home. So when you’re out of System 2 attention, you’re more prone to making mistakes in anything that requires logical, linear thinking. Errors of intuitive thought can be difficult for System 2 to catch on a good day. When System 2 is offline, you automatically assume them to be correct. As a result:

You will have trouble making, following, or checking the validity of a complex logical argument. You’ll be more likely to be led by the cognitive biases and distortions System 1 uses because they don’t require any effort and give you a comforting sense of cognitive ease.

You will have difficulty comparing the features of two items for overall value. If you have to make a choice, you’ll be more likely to go with what intuitively feels right or the item that has some emotionally compelling attribute (it reminds you of the one your mother had, for example, or reminds you of your mother).

You will be more gullible. You’ll be more likely to believe things you wouldn’t otherwise believe or be persuaded by empty messages, such as in commercials. System 2 is the skeptic, so the best time for someone to take advantage of you is when it is offline.

Intention or Response Errors

System 1 continuously picks up on cues and triggers in your environment to determine what situation you’re in and to predict what’s next. Any deviation from the norm requires System 2 attention. If it isn’t available, you’re likely to do not what you intended to do but whatever is normal for you in that situation. And without System 2 attention, you’re much more likely to respond automatically (habitually) to the stimulus (cue or trigger).

System 2 is in charge of self-control, continuously monitoring your behavior, keeping you polite, for example, when you’re angry. In the heat of the moment, when you’re out of System 2 attention, you’re much less likely to be able to suppress your immediate emotional reactions to people and situations.

System 1 has an answer for almost everything. But when it encounters a surprising situation (something it hasn’t previously encountered or that is unusual in that situation), it notifies System 2. You don’t need System 2 attention to drive a familiar route, but if you encounter an obstacle along that route, you need System 2 to figure out what it is and to respond appropriately to it.

System 2 is also in charge of will power. If you are in the process of trying to stop doing something you habitually do (such as raiding the refrigerator in the evening), you need System 2 to belay the impulse from System 1 to see if there’s more pie. Without System 2, you’re more likely to give in, look for the pie…and eat it.

You need System 2 if you want to take a different route from your usual one or make an extra stop you don’t normally make. Without adequate System 2 attention, you’re likely to find yourself taking the usual route and forgetting to make that stop.

Gatekeeping Errors

We all have biases, whether or not we’re aware of them and whether or not we want to admit it. While it’s easy to spot overt biases and prejudices in other people, most of your own biases are hidden even from you. In the case of biases toward specific groups of people, you’ve likely come to a reasoned conclusion they’re wrong and have chosen not to think about and treat other people based on stereotypes. But that doesn’t mean the biases have disappeared. They’re still part of System 1’s associative processing operations. It’s just that when System 1 suggests a biased response to System 2, System 2 normally overrides it. Per Daniel Kahneman:

Conflict between an automatic reaction (System 1) and an intention to control it (System 2) is common in our lives.

When System 2 is depleted, there is no one at the gate to keep the biased or prejudiced responses from getting through. You may simply have a biased thought. You may say something in the presence of others that you wouldn’t normally say. Or you may respond to another person based on a group stereotype. The thought, comment, or behavior may be something you later regret. If you were to claim it doesn’t represent what you believe or the way you really feel or think, you’d most likely be right.

But when you see a blatant expression of bias or prejudice in someone else—especially a celebrity—you might have a different reaction. You might assume their true colors are showing. We think that what we see in other people when their guard is down and they’re pushed or stressed reveals the truth about them. But the actual truth is that to the extent we have any civility at all, it’s because System 2 maintains it. Without System 2 you and I would have no ability to question our biases or prejudices, no ability to come to reasoned conclusions about them, and no ability to monitor and veto System 1’s automatic reactions.

Conclusion

It isn’t always necessary, advisable, or even possible to override System 1. But when you deplete System 2, you can’t override it even when you want or need to. Without System 2, you can’t think straight (logically and linearly). So:

Don’t try to make important decisions of any kind when you feel brain dead.
Don’t assume you’ll feel or think the same way about something the next day as you do when you’re stressed, sick, just completed your annual tax return, or have recently fallen in love.
Don’t stay up late to watch the QVC channel unless you have a lot of money you’re trying to unload.
Don’t keep pie around if you’re trying not to eat it.
Don’t get into debates about complex issues after you’ve had a few beers.
Don’t tax your working memory with details you can keep track of some other way.
Don’t take System 2’s censoring of your biases and prejudices for granted. And don’t assume other people’s mental lapses reveal deep-seated truths about them.

Be Good to Your Brain

December 4, 2014 by Joycelyn Campbell Leave a Comment

Want to stay mentally sharp? There are all kinds of things you can do: listen to music, read a book, gaze at a building, help someone out, get involved in a hobby.

These activities not only make you feel good, they also happen to be very good for your brain in a variety of different ways.

Click on the links to read the full articles.

Listening to music benefits the brain in 8 surprising ways.

Playing a musical instrument benefits your brain even more by giving it an excellent “full-body” workout.

Looking at buildings designed for contemplation may produce the same health benefits provided by meditation—and with less effort.

Dancing, getting some hobbies, and reading (among other things) all help to keep your brain young.

Speaking of reading, ditching the e-reader once in a while and reading an actual book can increase your comprehension, make you more empathetic, and even improve your sleep.

No matter how old you are, learning a new language improves gray matter density and white matter integrity.

Finally, giving really is better than receiving—for you and for your brain.

Be good to your brain and your brain will continue being good to you!