‘Noisy’ autistic brains seem better at certain tasks. Here’s why neuroaffirmative research matters
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Pratik Raul, University of Canberra; Jeroen van Boxtel, University of Canberra, and Jovana Acevska, University of Canberra
Autism is a neurodevelopmental difference associated with specific experiences and characteristics.
For decades, autism research has focused on behavioural, cognitive, social and communication difficulties. These studies highlighted how autistic people face issues with everyday tasks that allistic (meaning non-autistic) people do not. Some difficulties may include recognising emotions or social cues.
But some research, including our own study, has explored specific advantages in autism. Studies have shown that in some cognitive tasks, autistic people perform better than allistic people. Autistic people may have greater success in identifying a simple shape embedded within a more complex design, arranging blocks of different shapes and colours, or spotting an object within a cluttered visual environment (similar to Where’s Wally?). Such enhanced performance has been recorded in babies as young as nine months who show emerging signs of autism.
How and why do autistic individuals do so well on these tasks? The answer may be surprising: more “neural noise”.
What is neural noise?
Generally, when you think of noise, you probably think of auditory noise, the ups and downs in the amplitude of sound frequencies we hear.
A similar thing happens in the brain with random fluctuations in neural activity. This is called neural noise.
This noise is always present, and comes on top of any brain activity caused by things we see, hear, smell and touch. This means that in the brain, an identical stimulus that is presented multiple times won’t cause exactly the same activity. Sometimes the brain is more active, sometimes less. In fact, even the response to a single stimulus or event will fluctuate continuously.
Neural noise in autism
There are many sources of neural noise in the brain. These include how the neurons become excited and calm again, changes in attention and arousal levels, and biochemical processes at the cellular level, among others. An allistic brain has mechanisms to manage and use this noise. For instance, cells in the hippocampus (the brain’s memory system) can make use of neural noise to enhance memory encoding and recall.
Evidence for high neural noise in autism can be seen in electroencephalography (EEG) recordings, where increased levels of neural fluctuations were observed in autistic children. This means their neural activity is less predictable, showing a wider range of activity (higher ups and downs) in response to the same stimulus.
In simple terms, if we imagine the EEG responses like a sound wave, we would expect to see small ups and downs (amplitude) in allistic brains each time they encounter a stimulus. But autistic brains seem to show bigger ups and downs, demonstrating greater amplitude of neural noise.
Many studies have linked this noisy autistic brain with cognitive, social and behavioural difficulties.
But could noise be a bonus?
The diagnosis of autism has a long clinical history. A shift from the medical to a more social model has also seen advocacy for it to be reframed as a difference, rather than a disorder or deficit. This change has also entered autism research. Neuroaffirming research can examine the uniqueness and strengths of neurodivergence.
Psychology and perception researcher David Simmons and colleagues at the University of Glasgow were the first to suggest that while high neural noise is generally a disadvantage in autism, it can sometimes provide benefits due to a phenomenon called stochastic resonance. This is where optimal amounts of noise can enhance performance. In line with this theory, high neural noise in the autistic brain might enhance performance for some cognitive tasks.
Our 2023 research explores this idea. We recruited participants from the general population and investigated their performance on letter-detection tasks. At the same time, we measured their level of autistic traits.
We performed two letter-detection experiments (one in a lab and one online) where participants had to identify a letter when displayed among background visual static of various intensities.
By using the static, we added additional visual noise to the neural noise already present in our participants’ brains. We hypothesised the visual noise would push participants with low internal brain noise (or low autistic traits) to perform better (as suggested by previous research on stochastic resonance). The more interesting prediction was that noise would not help individuals who already had a lot of brain noise (that is, those with high autistic traits), because their own neural noise already ensured optimal performance.
Indeed, one of our experiments showed people with high neural noise (high autistic traits) did not benefit from additional noise. Moreover, they showed superior performance (greater accuracy) relative to people with low neural noise when the added visual static was low. This suggests their own neural noise already caused a natural stochastic resonance effect, resulting in better performance.
It is important to note we did not include clinically diagnosed autistic participants, but overall, we showed the theory of enhanced performance due to stochastic resonance in autism has merits.
Why this is important?
Autistic people face ignorance, prejudice and discrimination that can harm wellbeing. Poor mental and physical health, reduced social connections and increased “camouflaging” of autistic traits are some of the negative impacts that autistic people face.
So, research underlining and investigating the strengths inherent in autism can help reduce stigma, allow autistic people to be themselves and acknowledge autistic people do not require “fixing”.
The autistic brain is different. It comes with limitations, but it also has its strengths.
Pratik Raul, PhD candidiate, University of Canberra; Jeroen van Boxtel, Associate professor, University of Canberra, and Jovana Acevska, Honours Graduate Student, University of Canberra
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Should I get a weighted vest to boost my fitness? And how heavy should it be?
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Exercise training while wearing a weighted vest is undergoing somewhat of a renaissance. Social media posts and trainers are promoting them as a potential strategy for improving fitness and health.
Exercising with additional weight attached to the body is nothing new. This idea has been used with soldiers for many centuries if not millennia – think long hikes with a heavy pack.
The modern weighted vest comes in a range of designs that are more comfortable and can be adjusted in terms of the weight added. But could one be helpful for you?
ZR10/Shutterstock What the research says
One of the earliest research studies, reported in 1993, followed 36 older people wearing weighted vests during a weekly exercise class and at home over a 20-week period. Wear was associated with improvements in bone health, pain and physical function.
Since then, dozens of papers have evaluated the exercise effects of wearing a weighted vest, reporting a range of benefits.
Not surprisingly, exercise with a weighted vest increases physiological stress – or how hard the body has to work – as shown by increased oxygen uptake, heart rate, carbohydrate utilisation and energy expenditure.
Adding weight equal to 10% of body weight is effective. But it doesn’t appear the body works significantly harder when wearing 5% extra weight compared to body weight alone.
Does more load mean greater injury risk?
A small 2021 study suggested additional weights don’t alter the biomechanics of walking or running. These are important considerations for lower-limb injury risk.
The safety considerations of exercising with weighted vests have also been reported in a biomechanical study of treadmill running with added weight of 1% to 10% of body weight.
While physiological demand (indicated by heart rate) was higher with additional weight and the muscular forces greater, running motion was not negatively affected.
To date no research studies have reported increased injuries due to wearing weighted vests for recreational exercise. However a 2018 clinical study on weight loss in people with obesity found back pain in 25% of those wearing such vests. Whether this can be translated to recreational use in people who don’t have obesity is difficult to say. As always, if pain or discomfort is experienced then you should reduce the weight or stop vest training.
Better for weight loss or bone health?
While wearing a weighted vest increases the energy expenditure of aerobic and resistance exercise, research to show it leads to greater fat loss or retaining muscle mass is somewhat inconclusive.
One older study investigated treadmill walking for 30 minutes, three times a week in postmenopausal women with osteoporosis. The researchers found greater fat loss and muscle gain in the participants who wore a weighted vest (at 4–8% body weight). But subsequent research in obese older adults could not show greater fat loss in participants who wore weighted vests for an average of 6.7 hours per day.
There has been considerable interest in the use of weighted vests to improve bone health in older people. One 2003 study reported significant improvements in bone density in a group of older women over 32 weeks of weighted vest walking and strength training compared to a sedentary control group.
But a 2012 study found no difference in bone metabolism between groups of postmenopausal women with osteoporosis walking on a treadmill with or without a weighted vest.
Making progress
As with any exercise, there is a risk of injury if it is not done correctly. But the risk of weighted vest training appears low and can be managed with appropriate exercise progression and technique.
If you are new to training, then the priority should be to simply start exercising and not complicate it with wearing a weighted vest. The use of body weight alone will be sufficient to get you on the path to considerable gains in fitness.
Once you have a good foundation of strength, aerobic fitness and resilience for muscles, joints and bones, using a weighted vest could provide greater loading intensity as well as variation.
It is important to start with a lighter weight (such as 5% bodyweight) and build to no more than 10% body weight for ground impact exercises such as running, jogging or walking.
For resistance training such as squats, push-ups or chin-ups, progression can be achieved by increasing loads and adjusting the number of repetitions for each set to around 10 to 15. So, heavier loads but fewer repetitions, then building up to increase the load over time.
While weighted vests can be used for resistance training, it is probably easier and more convenient to use barbells, dumbbells, kettle bells or weighted bags.
The benefits of added weight can also be achieved by adding repetition or duration. Geert Pieters/Unsplash The bottom line
Weighted vest training is just one tool in an absolute plethora of equipment, techniques and systems. Yes, walking or jogging with around 10% extra body weight increases energy expenditure and intensity. But training for a little bit longer or at a higher intensity can achieve similar results.
There may be benefits for bone health in wearing a weighted vest during ground-based exercise such as walking or jogging. But similar or greater stimulus to bone growth can be achieved by resistance training or even the introduction of impact training such as hopping, skipping or bounding.
Exercising with a weighted vest likely won’t increase your injury risk. But it must be approached intelligently considering fitness level, existing and previous injuries, and appropriate progression for intensity and repetition.
Rob Newton, Professor of Exercise Medicine, Edith Cowan University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Gut-Healthy Spaghetti Chermoula
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Chermoula is a Maghreb relish/marinade (it’s used for both purposes); it’s a little like chimichurri but with distinctly N. African flavors. The gut-healthiness starts there (it’s easy to forget that olives—unless fresh—are a fermented food full of probiotic Lactobacillus sp. and thus great for the gut even beyond their fiber content), and continues in the feta, the vegetables, and the wholewheat nature of the pasta. The dish can be enjoyed at any time, but it’s perfect for warm summer evenings—perhaps dining outside, if you’ve place for that.
You will need
- 9oz wholewheat spaghetti (plus low-sodium salt for its water)
- 10oz broccoli, cut into small florets
- 3oz cilantro (unless you have the soap gene)
- 3oz parsley (whether or not you included the cilantro)
- 3oz green olives, pitted, rinsed
- 1 lemon, pickled, rinsed
- 1 bulb garlic
- 3 tbsp pistachios, shelled
- 2 tbsp mixed seeds
- 1 tsp cumin
- 1 tsp chili flakes
- ½ cup extra virgin olive oil
- For the garnish: 3oz feta (or plant-based equivalent), crumbled, 3oz sun-dried tomatoes, diced, 1 tsp cracked black pepper
Note: why are we rinsing the things? It’s because while picked foods are great for the gut, the sodium can add up, so there’s no need to bring extra brine with them too. By doing it this way, there’ll be just the right amount for flavor, without overdoing it.
Method
(we suggest you read everything at least once before doing anything)
1) Cook the spaghetti as you normally would, but when it’s a minute or two from being done, add the broccoli in with it. When it’s done, drain and rinse thoroughly to get rid of excess starch and salt, and also because cooling it even temporarily (as in this case) lowers its glycemic index.
2) Put the rest of the ingredients into a food processor (except the olive oil and the garnish), and blitz thoroughly until no large coarse bits remain. When that’s done, add the olive oil, and pulse it a few times to combine. We didn’t add the olive oil previously, because blending it so thoroughly in that state would have aerated it in a way we don’t want.
3) Put ⅔ of the chermoula you just made into the pan you used for cooking the spaghetti, and set it over a medium heat. When it starts bubbling, return the spaghetti and broccoli to the pan, mixing gently but thoroughly. If the pasta threatens to stick, you can add a little more chermoula, but go easy on it. Any leftover chermoula that you didn’t use today, can be kept in the fridge and used later as a pesto.
4) Serve! Add the garnish as you do.
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Less Obvious Probiotics Benefits
- Making Friends With Your Gut (You Can Thank Us Later)
- What Matters Most For Your Heart? ← spoiler: this is why, while we do watch the sodium, we care more about the fiber
- All about Olive Oil: Is “Extra Virgin” Worth It?
- Our Top 5 Spices: How Much Is Enough For Benefits?
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Why Do We Have Crooked Teeth When Our Ancestors Didn’t?
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Evidence shows that people in ancient times typically had straight teeth set well into strong jaws, with even wisdom teeth fitting properly.
So, what went wrong? Did evolution do us a disservice?
Some information to chew on
Transition from hard-to-chew diets to processed, refined foods over millennia has reduced jaw size while tooth size stayed constant. Smaller jaws lead to tooth crowding, crookedness, and impacted wisdom teeth, requiring braces or extractions in modern times.
However, all is not lost!
Studies on non-human animals show softer diets reduce jaw and facial growth, causing dental crowding. In other words: dental crowding is primarily attributed to dietary and lifestyle changes, though genetics may play a role.
And notably, when it comes to humans, populations with less processed diets experience fewer dental problems, suggesting lifestyle modifications could help prevent tooth crowding.
And no, it is not too late. Remember, you are rebuilding your body all the time, including your bones!
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:
The Exercises That Can Fix Sinus Problems (And More) ← this also improves the jaw structure
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The Spectrum of Hope – by Dr. Gayatri Devi
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We’ve written before about Dr. Devi’s work (See: “Alzheimer’s: The Bad News And The Good“) but she has plenty more to say than we could fit in an article.
The book is written for patients, family/carers, and clinicians—without getting deep into the science, which it is assumed clinicians will know. the general style of the book is pop-science, and it’s more about addressing the misconceptions around Alzheimer’s, rather than focusing on neurological features such as beta amyloid plaques and tau proteins and the like.
Dr. Devi explains a lot about the experience of Alzheimer’s—what to expect, or rather, what to know about in advance. Because, as she explains, there are a lot of different manifestations of Alzheimer’s that are all lumped under the same umbrella.
This means that a person could have negligible memory but perfect language and reasoning skills, or the other way around, or some other combination of symptoms showing up or not.
Which means that any plan for managing one’s Alzheimer’s needs to be adaptable and personalized, which is something Dr. Devi talks us through, too.
Bottom line: if you are a loved one has Alzheimer’s, or you just like to be prepared, this is a great book to prepare anybody for just that.
Click here to check out The Spectrum of Hope, and hold onto that hope!
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Mosquitoes can spread the flesh-eating Buruli ulcer. Here’s how you can protect yourself
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Each year, more and more Victorians become sick with a flesh-eating bacteria known as Buruli ulcer. Last year, 363 people presented with the infection, the highest number since 2004.
But it has been unclear exactly how it spreads, until now. New research shows mosquitoes are infected from biting possums that carry the bacteria. Mozzies spread it to humans through their bite.
What is Buruli ulcer?
Buruli ulcer, also known as Bairnsdale ulcer, is a skin infection caused by the bacterium Mycobacterium ulcerans.
It starts off like a small mosquito bite and over many months, slowly develops into an ulcer, with extensive destruction of the underlying tissue.
While often painless initially, the infection can become very serious. If left untreated, the ulcer can continue to enlarge. This is where it gets its “flesh-eating” name.
Thankfully, it’s treatable. A six to eight week course of specific antibiotics is an effective treatment, sometimes supported with surgery to remove the infected tissue.
Where can you catch it?
The World Health Organization considers Buruli ulcer a neglected tropical skin disease. Cases have been reported across 33 countries, primarily in west and central Africa.
However, since the early 2000s, Buruli ulcer has also been increasingly recorded in coastal Victoria, including suburbs around Melbourne and Geelong.
Scientists have long known Australian native possums were partly responsible for its spread, and suspected mosquitoes also played a role in the increase in cases. New research confirms this.
Our efforts to ‘beat Buruli’
Confirming the role of insects in outbreaks of an infectious disease is achieved by building up corroborating, independent evidence.
In this new research, published in Nature Microbiology, the team (including co-authors Tim Stinear, Stacey Lynch and Peter Mee) conducted extensive surveys across a 350 km² area of Victoria.
We collected mosquitoes and analysed the specimens to determine whether they were carrying the pathogen, and links to infected possums and people. It was like contact tracing for mosquitoes.
Aedes notoscriptus was the mosquito identified as carrying the bacteria that caused Buruli ulcer.
Cameron Webb (NSW Health Pathology)Molecular testing of the mosquito specimens showed that of the two most abundant mosquito species, only Aedes notoscriptus (a widespread species commonly known as the Australian backyard mosquito) was positive for Mycobacterium ulcerans.
We then used genomic tests to show the bacteria found on these mosquitoes matched the bacteria in possum poo and humans with Buruli ulcer.
We further analysed mosquito specimens that contained blood to show Aedes notoscriptus was feeding on both possums and humans.
To then link everything together, geospatial analysis revealed the areas where human Buruli ulcer cases occur overlap with areas where both mosquitoes and possums that harbour Mycobacterium ulcerans are active.
Stop its spread by stopping mozzies breeding
The mosquito in this study primarily responsible for the bacteria’s spread is Aedes notoscriptus, a mosquito that lays its eggs around water in containers in backyard habitats.
Controlling “backyard” mosquitoes is a critical part of reducing the risk of many global mosquito-borne disease, especially dengue and now Buruli ulcer.
You can reduce places where water collects after rainfall, such as potted plant saucers, blocked gutters and drains, unscreened rainwater tanks, and a wide range of plastic buckets and other containers. These should all be either emptied at least weekly or, better yet, thrown away or placed under cover.
Mosquitoes can lay eggs in a wide range of water-filled items in the backyard.
Cameron Webb (NSW Health Pathology)There is a role for insecticides too. While residual insecticides applied to surfaces around the house and garden will reduce mosquito populations, they can also impact other, beneficial, insects. Judicious use of such sprays is recommended. But there are ecological safe insecticides that can be applied to water-filled containers (such as ornamental ponds, fountains, stormwater pits and so on).
Recent research also indicates new mosquito-control approaches that use mosquitoes themselves to spread insecticides may soon be available.
How to protect yourself from bites
The first line of defence will remain personal protection measures against mosquito bites.
Covering up with loose fitted long sleeved shirts, long pants, and covered shoes will provide physical protection from mosquitoes.
Applying topical insect repellent to all exposed areas of skin has been proven to provide safe and effective protection from mosquito bites. Repellents should include diethytolumide (DEET), picaridin or oil of lemon eucalyptus.
While the rise in Buruli ulcer is a significant health concern, so too are many other mosquito-borne diseases. The steps to avoid mosquito bites and exposure to Mycobacteriam ulcerans will also protect against viruses such as Ross River, Barmah Forest, Japanese encephalitis, and Murray Valley encephalitis.
Cameron Webb, Clinical Associate Professor and Principal Hospital Scientist, University of Sydney; Peter Mee, Adjunct Associate Lecturer, School of Applied Systems Biology, La Trobe University; Stacey Lynch, Team Leader- Mammalian infection disease research, CSIRO, and Tim Stinear, Professor of Microbiology, The University of Melbourne
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Broccoli vs Asparagus – Which is Healthier?
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Our Verdict
When comparing broccoli to asparagus, we picked the broccoli.
Why?
Both are great! But broccoli does distinguish itself:
In terms of macros, broccoli has slightly more protein, carbs, and fiber. The two vegetables have the same glycemic index. We’ll call this a slight win for broccoli based mainly on the higher fiber, but it’s not by a huge amount.
When it comes to vitamins, broccoli has more of vitamins B5, B6, B9, C, K, and choline, whereas asparagus has more of vitamins A, B1, B2, B3, and E. This would already be a 6:5 marginal win for broccoli, but it’s worth bearing in mind that broccoli’s margins are greater, especially with broccoli having around 15x the amount of vitamin C. So, a clear win for broccoli, respectable as asparagus may be.
In the category of minerals, broccoli has more calcium, magnesium, manganese, phosphorus, potassium, and selenium, while asparagus boasts more copper, iron, and zinc. A 6:3 win for broccoli here.
Both vegetables also contain generous amounts of antioxidant polyphenols and other beneficial phytochemicals, often a little different from each other, so that’s a case for enjoying both.
Still, if you’re going to pick just one, we recommend the broccoli!
Want to learn more?
You might like to read:
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