Worldwide, alcohol and tobacco cause much more death, disability and addiction than illegal drugs, according to a new review. The review analyzed data from 2015 on global drug use — both overall and in 21 different regions — using data from the World Health Organization, the United Nations Office on Drugs and Crime, and the Institute for Health Metrics and Evaluation, as well as other sources.
The researchers examined both the prevalence of drug use as well as the “health burden,” in the form of death and disability tied to drugs. The researchers found that, worldwide, an estimated 18 percent of people reported “heavy” alcohol use in the last month (heavy use corresponds to more than 60 grams of alcohol, or about four standard drinks, on one occasion).
iIn addition, 15 percent reported daily tobacco smoking, 3.8 percent reported marijuana use in the past year, 0.77 percent reported amphetamine use in the past year, 0.37 percent reported non-medical opioid use in the past year and 0.35 percent reported cocaine use in the past year….Continue reading…
The Addictions Neuroclinical Assessment is used to diagnose addiction disorders. This tool measures three different domains: executive function, incentive salience, and negative emotionality. Executive functioning consists of processes that would be disrupted in addiction. In the context of addiction, incentive salience determines how one perceives the addictive substance. Increased negative emotional responses have been found with individuals with addictions.
This is a screening and assessment tool in one, assessing commonly used substances. This tool allows for a simple diagnosis, eliminating the need for several screening and assessment tools, as it includes both TAPS-1 and TAPS-2, screening and assessment tools respectively. The screening component asks about the frequency of use of the specific substance (tobacco, alcohol, prescription medication, and other). If an individual screens positive, the second component will begin. This dictates the risk level of the substance.
The CRAFFT (Car-Relax-Alone-Forget-Family and Friends-Trouble) is a screening tool that is used in medical centers. The CRAFFT is in version 2.1 and has a version for nicotine and tobacco use called the CRAFFT 2.1+N. This tool is used to identify substance use, substance related driving risk, and addictions among adolescents. This tool uses a set of questions for different scenarios.
In the case of a specific combination of answers, different question sets can be used to yield a more accurate answer. After the questions, the DSM-5 criteria are used to identify the likelihood of the person having substance use disorder. After these tests are done, the clinician is to give the “5 RS” of brief counseling.
The five Rs of brief counseling includes:
REVIEW screening results
RECOMMEND to not use
RIDING/DRIVING risk counseling
RESPONSE: elicit self-motivational statements
REINFORCE self-efficacy
The Drug Abuse Screening Test (DAST) is a self-reporting tool that measures problematic substance use.Responses to this test are recorded as yes or no answers, and scored as a number between zero and 28. Drug abuse or dependence, are indicated by a cut off score of 6.Three versions of this screening tool are in use: DAST-28, DAST-20, and DAST-10. Each of these instruments are copyrighted by Dr. Harvey A. Skinner.
The Alcohol, Smoking, and Substance Involvement Test (ASSIST) is an interview-based questionnaire consisting of eight questions developed by the WHO. The questions ask about lifetime use; frequency of use; urge to use; frequency of health, financial, social, or legal problems related to use; failure to perform duties; if anyone has raised concerns over use; attempts to limit or moderate use; and use by injection.
The transtheoretical model of change (TTM) can point to how someone may be conceptualizing their addiction and the thoughts around it, including not being aware of their addiction. Cognitive control and stimulus control, which is associated with operant and classical conditioning, represent opposite processes (i.e., internal vs external or environmental, respectively) that compete over the control of an individual’s elicited behaviors.
Genetic factors, along with socio-environmental (e.g., psychosocial) factors, have been established as significant contributors to addiction vulnerability. Studies done on 350 hospitalized drug-dependent patients showed that over half met the criteria for alcohol abuse, with a role of familial factors being prevalent. Genetic factors account for 40–60% of the risk factors for alcoholism.
Similar rates of heritability for other types of drug addiction have been indicated, specifically in genes that encode the Alpha5 Nicotinic Acetylcholine Receptor. Knestler hypothesized in 1964 that a gene or group of genes might contribute to predisposition to addiction in several ways. For example, altered levels of a normal protein due to environmental factors may change the structure or functioning of specific brain neurons during development.
These altered brain neurons could affect the susceptibility of an individual to an initial drug use experience. In support of this hypothesis, animal studies have shown that environmental factors such as stress can affect an animal’s genetic expression.
In humans, twin studies into addiction have provided some of the highest-quality evidence of this link, with results finding that if one twin is affected by addiction, the other twin is likely to be as well, and to the same substance. Further evidence of a genetic component is research findings from family studies which suggest that if one family member has a history of addiction, the chances of a relative or close family developing those same habits are much higher than one who has not been introduced to addiction at a young age.
The data implicating specific genes in the development of drug addiction is mixed for most genes. Many addiction studies that aim to identify specific genes focus on common variants with an allele frequency of greater than 5% in the general population. When associated with disease, these only confer a small amount of additional risk with an odds ratio of 1.1–1.3 percent; this has led to the development the rare variant hypothesis, which states that genes with low frequencies in the population (<1%) confer much greater additional risk in the development of the disease.
Genome-wide association studies (GWAS) are used to examine genetic associations with dependence, addiction, and drug use.These studies rarely identify genes from proteins previously described via animal knockout models and candidate gene analysis. Instead, large percentages of genes involved in processes such as cell adhesion are commonly identified. The important effects of endophenotypes are typically not capable of being captured by these methods.
Genes identified in GWAS for drug addiction may be involved either in adjusting brain behavior before drug experiences, subsequent to them, or both….
Sent into apoplexy by whistling noses? Can’t bear the sound of people eating? You could be one of the many people affected by this potentially debilitating condition. As a teenager, I remember being moved almost to tears by the sound of a family member chewing muesli. A friend eating dumplings once forced me to flee the room.
The noises one former housemate makes when chomping popcorn mean I have declined their invitations to the cinema for nearly 20 years. I am not proud of myself for reacting like this – in fact, I am pretty embarrassed – but my responses feel unavoidable. It is probable that I have misophonia. According to a scientific paper published last year, so do 18% of people in the UK.
Otherwise known as “sound rage”, misophonia is “a decreased tolerance to certain sounds” says Jane Gregory, a clinical psychologist at the University of Oxford who co-authored the paper and counts herself among the 18%. Sound triggers are usually repetitive, she says. It is not about “the volume of the sound or necessarily the acoustic pattern”, but what it means to the observer.
Eating sounds are most commonly reported, closely followed by so-called throat sounds. (Gregory is driven spare by the sound of pigeons.) “Chewing, crunching, snorting, sniffing, throat clearing, nose whistling, heavy breathing,” rattles off Dr Zach Rosenthal, who runs the Centre for Misophonia and Emotion Regulation at Duke university in Durham, North Carolina. “These are all relatively ordinary everyday things that people need to do, but in people with misophonia they are experienced as highly aversive.”
That “aversive reaction” can take the form of physical changes such as increased muscle tension or heart rate, or emotional responses such as irritability, shame and anxiety. It brings on a fight, flight or even a freeze response where, according to Gregory, “you get a really strong adrenaline reaction and it tells you that you’re either in danger or you’re being violated”.
Only about 14% of the UK population are aware of misophonia, according to Gregory’s paper, a collaboration with King’s College London. Perhaps one of the reasons, she suggests, is simply that it is hard to talk about. “You are essentially telling someone: ‘The sound of you eating and breathing – the sounds of you keeping yourself alive – are repulsing me.’ It’s really hard to find a polite way to say that.”
Maybe the movie Tár will help: its protagonist, played by Cate Blanchett, has an extreme reaction to the sound of a metronome. Theories about how misophonia develops are exactly that. “A lot of people say they had always been a little bit sensitive to sound, but then they remember a certain time when it suddenly got a lot worse,” says Gregory. Rosenthal says it typically presents itself in late childhood or early teens and is often associated with family members.
“People ask me all the time: ‘Why my family? Why my parents?’” The explanation feels comfortingly logical: “You’re not blaming, you’re not judging – you were probably just around them the most.” You might have clocked a sibling eating baked beans, say, then once you have noticed it your brain begins to look out for it.
Rosenthal describes the whirlpool: “It starts to be aversive and then I pay more attention to it, and then the more attention I pay to it the more I notice it, and then the more I notice it the more aversive it becomes …”
The impact can be severe. Gregory knows of relationships that have ended over misophonia; she has encountered people who have moved several times to escape triggering neighbours. Others must pick careers based on where they can work without being bothered by sounds. “If you don’t get any respite from it, you can get desperate,” she says.
You get a really strong adrenaline reaction and it tells you that you’re either in danger or you’re being violated…Jane Gregory
Strategies might help, however, such as introducing background noise when eating. Gregory’s husband, who knows better than to eat Monster Munch at home, can tell if she is bothered by a sound, because she will suddenly call out: “Siri, play Taylor Swift!”
Sometimes the best option is to walk away. Gregory suggests then “slowing down your breathing, or just giving your mind a little job to do”, such as playing a game for a minute. By the time you re-enter the room, the sound might be gone, or you might feel better equipped, “because you know what’s coming”.
She also recommends “opposite action – this idea that sometimes the more we avoid something or block it out, the more harmful it feels to us. In CBT [cognitive behavioral therapy], we do the opposite of what you feel like doing.” In this vein, she tries to fight her instinct to glare at her husband, gazing adoringly at him instead: “It’s a way of tripping up your brain and saying: remember that you love this person, remember that you’re not actually in danger.”
I make a note to try this the next time I hear someone eating scrambled eggs.
When we think about ways to improve and refine and improve our content marketing strategy, we probably don’t think about the field of neuroscience. But this academic discipline offers many insights into how to market a product or service—so many insights, in fact, that it’s become a field of its own.
We call this field neuromarketing, and it involves take advantage of the wealth of information gleaned from measuring the brain’s electrical fluctuations to drive positive engagement with marketing messages. Most businesses, of course, are not going to hire a neuroscientist to analyze the effectiveness of their content marketing strategies.
At the same time, there is all sorts of feedback, information, and advice we can take from existing neuromarketing research to help us put together more focused, results-driven content marketing plans. Let’s explore five of the most important ways we can use insights from the field of neuromarketing to improve and refine a content marketing strategy:
Use emotions to wake up the brain: Our brains kick into high gear when we’re stimulated by powerful, intense emotions. If a visceral emotion that we feel is a positive experience, our brains wake us up so we can enjoy the pleasure-inducing aspects of the experience; if the visceral emotion we feel is negative, our brains also wake us up—in this case, to actively plot out how to protect and insulate ourselves from the negative experience.
Thus, content that triggers strong emotions (whether positive or negative) plays a key role in activating our brains, which, in turn, makes us more likely to absorb and retain the content that’s in front of us.
Appeal to the brain’s self-serving instincts: Our brains have evolved to be self-serving, to react in ways that keep us alive (i.e., the survival instinct) and to help us feel good about ourselves. Thus, content marketing pieces that stroke the readers’ ego and make them feel validated and at peace with their own emotional, physical, and mental condition is more likely to be well-received.
Feed the brain’s desire for familiarity: The reason that branding is so powerful in the marketing world is because of our brain’s desire to derive consistency and comfort from interactions with the world around us. Indeed, when we recognize familiar patterns, our brains respond by producing the pleasure-inducing neurochemical dopamine. In the world of content marketing, these familiar patterns include the fonts, images, graphics, and color choices we use in content production.
Help the brain to avoid complexity: Obviously we should be doing everything we can to make our content pieces as simple and straightforward for the reader. But did you know that anything that our brains perceive as difficult to process and interpret automatically becomes a more complicated and time-consuming task? That means we must be cognizant of all potential access barriers, including a poor font choice or a complex graphic or a too-big block of text.
Surprise the brain with unexpected word choices: When we’re consuming a piece of content, our brains are wired to process information quickly by essentially predicting and pre-processing the words and sentence constructions we expect to consume. In this way, we’re able to skip and skim through content while still absorbing its central messages and themes. Therefore, in the world of content marketing, we want use unexpected word choices and sentence constructions that stimulate and wake up our brains.
For example, if we read the phrase, “Money doesn’t grow on _____,” our brain is likely to automatically pre-fill in the final word (i.e., “trees”). However, if instead we encounter the words “designer jeans”—as in, “Money doesn’t grow on designer jeans”—our brain suddenly wakes up and our interest is piqued. Thus, as content marketers, we want to learn to play word games and manipulate language (sparingly, of course).
There’s no question our brains are instinctively activated by certain types of stimulation. Our challenge is to harness and channel the right types of stimulation to create more effective marketing content. Fortunately, neuroscience can be an important asset for us, teaching us how to use emotions to wake up our brain, how to appeal to our brain’s innately self-serving interests, how to feed our brain’s desire for familiarity and simplicity, and how to surprise our brain with word games and other unexpected language manipulations.
I’m an entrepreneur and writer who is passionate about startups and marketing. I am also the founder of Foxtail Marketing, a digital demand generation firm.
For some reason, negotiation tends to be considered a specialized professional skill instead of a basic life one. Business school students and salespeople learn tons about how to work out deals, but most of the rest of us never learn much about how to negotiate. That’s one reason why buying a major asset like a house or car is so stressful for regular folks—negotiating is mysterious to us.
But everyone negotiates on a constant basis, and learning some of the fundamentals of banging out a mutually-beneficial deal is a crucial skill we should all acquire. The challenges of learning how to bargain is often the mixture of emotion, psychology, and math. Leverage can swing back and forth between parties, and emotions can play as much of a role as finances (as anyone who has overpaid for a house because they “fell in love with it” can attest).
That’s why learning some basic negotiation skills is essential—starting with why you should always seriously consider making the first offer.
The Anchoring Effect
You’ve probably heard that you should always make the first offer when negotiating, possibly with some vague explanation about setting the terms. This is, in fact, generally good advice—because of something called the Anchoring Effect.
The Anchoring Effect is all about bias—it’s an irrational tendency in human beings to rely on the first piece of data they acquire, regardless of its value. We all have this bias—study after study has confirmed that the first number you hear will influence how you value something. When sellers make the first offer, the final price is usually higher, and one study found that 85% of negotiated outcomes generally aligned with the first offer.
The crazy part is, even when we know the first piece of data shouldn’t affect us, it does. In one experiment, people were asked to write down the last two digits of their own social security number and then asked if they would pay that much for various items. Then, they were asked to bid for the same things, and despite the fact that the “seed” number they’d been given was completely unrelated to anything, folks with higher social security numbers bid much higher for everything.
Dropping the anchor
The irrational power of the Anchoring Effect is why making the first offer (sometimes called “dropping the anchor”) is a powerful tool in a negotiation. But that doesn’t mean it always works—you need to know how to use it in order to get the full benefit of the effect.
Here are some things to consider when planning to drop an anchor into a negotiation:
Be aggressive. People often worry that being overly aggressive with an opening offer or price will insult or scare off the other party. But an aggressive first offer is your best strategy. An aggressive first offer leaves you room to “compromise,” while still getting a better deal in the end (a form of the “Door in the Face” technique).
Don’t be absurd. Keep in mind that “aggressive” doesn’t mean “insane.” While an aggressive first offer can set the goalposts in your favor, throwing out an offer that is completely out of line with reality can make the other side wonder if you’re serious, competent, or credible.
Be specific. The more precise your first offer is, the more effective it will be in anchoring your opposition. The classic example is pricing a house: A list price of $255,500 will get higher bids than a list price of $255,000—or $256,000.
By putting some thought into the specifics of your first offer, you can most benefit from the irrational power of the Anchoring Effect.
Other negotiating success factors
As powerful as the Anchoring Effect can be in a negotiation, it’s not a magic spell. The first thing to keep in mind is that if you’re dealing with an experienced and trained business or sales professional, chances are they know all about it and have been trained in ways to “defuse” the anchor, which is often as simple as ignoring it and pivoting to details, or offering an immediate “counter-anchor” in an effort to redefine the terms.
The key to a successful anchoring first offer is information, really. The ideal scenario for dropping an anchor is when you know more than the other side. When the other party has access to more information than you do, it’s very difficult to drop an anchor. For example, if a homeowner knows the real estate market in their area well, they know how much their property is worth, and your aggressive anchor will simply seem absurd.
Or consider interviewing for a job—the interviewer knows what the budgeted salary for a position is, and you don’t. If your first salary ask is way outside that budget, it’s not going to have the intended effect. On the other hand, if you both know the same amount of information, your anchor will be predictable and expected, making it easier to defuse.
And if you’re both in the dark, a first offer will be pretty much a guess, making it impossible to know whether you’re actually helping yourself with your shot in the dark anchor. All that being said, making the first offer has been proven to have a beneficial psychological effect on the other side of a negotiation. So use this power. Just do your research first.
“The ‘Inherent Bad Faith Model’ Reconsidered: Dulles, Kennedy, and Kissinger”, Political Psychology(subscription required)“… the most widely studied is the inherent bad faith model of one’s opponent …”, The handbook of social psychology, Volumes 1-2, edited by Daniel T. Gilbert, Susan T. Fiske, Gardner Lindzey
Four Strategies for Making Concessions, Harvard Business School, Working Knowledge, published 6 March 2006, accesses 2 June 2021“Negotiation”(PDF). Saylor Academy. Retrieved 10 April 2022.Journal of Personality and Social Psychology, 83 (5) (2002), pp. 1131–1140
“negotiation”. Online Etymology Dictionary. Retrieved 19 August 2019.“The Day-to-Day Life of a Dean: Engaging in Negotiations and negotiations”. Negotiation Journal 475-488. 28 (4): 475–488. doi:10.1111/j.1571-9979.2012.00352.x.Fisher, R.; Ury, W.; Patton, B. (2012). Getting to yes: Negotiating agreement without giving in. Penguin: New York.
Neuroscientists have begun to uncover how breathing is coordinated with other behaviors and how its rhythm may influence a variety of regions in the brain....CREDIT: ESTHER AARTS
If you’re lucky enough to live to 80, you’ll take up to a billion breaths in the course of your life, inhaling and exhaling enough air to fill about 50 Goodyear blimps or more. We take about 20,000 breaths a day, sucking in oxygen to fuel our cells and tissues, and ridding the body of carbon dioxide that builds up as a result of cellular metabolism. Breathing is so essential to life that people generally die within minutes if it stops.
It’s a behavior so automatic that we tend to take it for granted. But breathing is a physiological marvel — both extremely reliable and incredibly flexible. Our breathing rate can change almost instantaneously in response to stress or arousal and even before an increase in physical activity. And breathing is so seamlessly coordinated with other behaviors like eating, talking, laughing and sighing that you may have never even noticed how your breathing changes to accommodate them. Breathing can also influence your state of mind, as evidenced by the controlled breathing practices of yoga and other ancient meditative traditions.
In recent years, researchers have begun to unravel some of the underlying neural mechanisms of breathing and its many influences on body and mind. In the late 1980s, neuroscientists identified a network of neurons in the brainstem that sets the rhythm for respiration. That discovery has been a springboard for investigations into how the brain integrates breathing with other behaviors. At the same time, researchers have been finding evidence that breathing may influence activity across wide swaths of the brain, including ones with important roles in emotion and cognition.
“Breathing has a lot of jobs,” says Jack L. Feldman, a neuroscientist at the University of California, Los Angeles, and coauthor of a recent article on the interplay of breathing and emotion in the Annual Review of Neuroscience. “It’s very complicated because we’re constantly changing our posture and our metabolism, and it has to be coordinated with all these other behaviors.”
Each breath a symphony of lung, muscle, brain
Every time you inhale, your lungs fill with oxygen-rich air that then diffuses into your bloodstream to be distributed throughout your body. A typical pair of human lungs contains about 500 million tiny sacs called alveoli, the walls of which are where gases pass between the airway and bloodstream. The total surface area of this interface is about 750 square feet — a bit more than the square footage of a typical one-bedroom apartment in San Francisco, and a bit less than that of a racquetball court.
“The remarkable thing about mammals, including humans, is that we pack an enormous amount of surface area into our chests,” says Feldman. More surface area means more gas is exchanged per second.
But the lungs can’t do it alone. They’re essentially limp sacks of tissue. “In order for this to work, the lungs have to be pumped like a bellows,” Feldman says. And they are — with each inhalation, the diaphragm muscle at the bottom of the chest cavity contracts, moving downward about half an inch. At the same time, the intercostal muscles between the ribs move the rib cage up and out — all of which expands the lungs and draws in air. (If you’ve ever had the wind knocked out of you by a blow to the stomach, you know all about the diaphragm; and if you’ve eaten barbecued ribs, you have encountered intercostal muscles.)
At rest, these muscles contract only during inhalation. Exhalation occurs passively when the muscles relax and the lungs deflate. During exercise, different sets of muscles contract to actively force out air and speed up respiration.
Breathing requires coordinated movements of the diaphragm and intercostal muscles. When these muscles contract, air is drawn into the lungs, where hundreds of millions of tiny alveoli provide a surface where oxygen can diffuse into the blood and carbon dioxide can diffuse out. With each exhalation, these muscles relax, and air is forced back out.
Unlike the heart muscle, which has pacemaker cells that set its rhythm, the muscles that control breathing take their orders from the brain. Given the life-enabling importance of those brain signals, it took a surprisingly long time to track them down. One of the first to ponder their source was Galen, the Greek physician who noticed that gladiators whose necks were broken above a certain level were unable to breathe normally. Later experiments pointed to the brainstem, and in the 1930s, the British physiologist Edgar Adrian demonstrated that the dissected brainstem of a goldfish continues to produce rhythmic electrical activity, which he believed to be the pattern-generating signal underlying respiration.
But the exact location of the brainstem respiratory-pattern generator remained unknown until the late 1980s, when Feldman and colleagues narrowed it down to a network of about 3,000 neurons in the rodent brainstem (in humans it contains about 10,000 neurons). It’s now called the preBötzinger Complex (preBötC). Neurons there spontaneously exhibit rhythmic bursts of electrical activity that, relayed through intermediate neurons, direct the muscles that control breathing.
Over the years, some people have assumed Bötzinger must have been a famous anatomist, Feldman says, perhaps a German or Austrian. But in fact the name came to him in a flash during a dinner at a scientific conference where he suspected a colleague was inappropriately about to claim the discovery for himself. Feldman clinked his glass to propose a toast and suggested naming the brain region after the wine being served, which came from the area around Bötzingen, Germany. Perhaps lubricated by said wine, the others agreed, and the name stuck. “Scientists are just as weird as anyone else,” Feldman says. “We have fun doing things like this.”
A long, deep breath can express many things: sadness, relief, resignation, yearning, exhaustion. But we humans aren’t the only ones who sigh — it’s thought that all mammals do — and it may be because sighing has an important biological function in addition to its expressive qualities.
Pinpointing breath’s rhythm setters
Much of Feldman’s subsequent research has focused on understanding exactly how neurons in the preBötC generate the breathing rhythm. This work has also laid a foundation for his lab and others to investigate how the brain orchestrates the interplay between breathing and other behaviors that require alterations in breathing.
Sighing is one interesting example. A long, deep breath can express many things: sadness, relief, resignation, yearning, exhaustion. But we humans aren’t the only ones who sigh — it’s thought that all mammals do — and it may be because sighing has an important biological function in addition to its expressive qualities. Humans sigh every few minutes, and each sigh begins with an inhale that takes in about twice as much air as a normal breath. Scientists suspect this helps pop open collapsed alveoli, the tiny chambers in the lung where gas exchange occurs, much as blowing into a latex glove pops open the fingers. Several lines of evidence support this idea: Hospital ventilators programmed to incorporate periodic sighing, for example, have been shown to improve lung function and maintain patients’ blood oxygen levels.
In a study published in 2016 in Nature, Feldman and colleagues identified four small populations of neurons that appear to be responsible for generating sighs in rodents. Two of these groups of neurons reside in a brainstem region near the preBötC, and they send signals to the other two groups, which reside inside the preBötC. When the researchers killed these preBötC neurons with a highly selective toxin, the rats ceased to sigh, but their breathing remained robust. On the other hand, when scientists injected neuropeptides that activate the neurons, the rats sighed 10 times more frequently. In essence, the researchers conclude, these four groups of neurons form a circuit that tells preBötC to interrupt its regular program of normal-sized breaths and order up a deeper breath.
The preBötC also has a role in coordinating other behaviors with breathing. One of Feldman’s collaborators on the sighing paper, neuroscientist Kevin Yackle, and colleagues recently used mice to investigate interactions between breathing and vocalizations. When separated from their nest, newborn mice make ultrasonic cries, too high-pitched for humans to hear. There are typically several cries at regular intervals within a single breath, not unlike the syllables in human speech, says Yackle, who’s now at the University of California, San Francisco. “You have this slower breathing rhythm and then nested within it you have this faster vocalization rhythm,” he says.
To figure out how this works, the researchers worked their way backwards from the larynx, the part of the throat involved in producing sound. They used anatomical tracers to identify the neurons that control the larynx and follow their connections back to a cluster of cells in the brainstem, in an area they named the intermediate reticular oscillator (iRO). Using a variety of techniques, the researchers found that killing or inhibiting iRO neurons removes the ability to vocalize a cry, and stimulating them increases the number of cries per breath.
When the researchers dissected out slices of brain tissue with iRO neurons, the cells kept firing in a regular pattern. “These neurons produce a rhythm that’s exactly like the cries in the animal, where it’s faster than but nested within the preBötC breathing rhythm,” Yackle says.
Breathing appears to have far-reaching influences on the brain, including on regions with roles in cognition and emotion, such as the hippocampus, amygdala and prefrontal cortex. These effects may originate from signals generated by the brainstem breathing center, preBötC; from sensory inputs via the vagus nerve or olfactory system; or in response to levels of oxygen (O2) and carbon dioxide (CO2) in the blood.
Additional experiments suggested that iRO neurons help integrate vocalizations with breathing by telling the preBötC to make tiny inhalations that interrupt exhalation — enabling a series of brief cries to fit neatly within a single exhaled breath. That is, rhythmic crying isn’t produced by a series of exhalations, but rather from one long exhalation with several interruptions.
The findings, reported earlier this year in Neuron, may have implications for understanding human language. The number of syllables per second falls within a relatively narrow range across all human languages, Yackle says. Perhaps, he suggests, that’s due to constraints imposed by the need to coordinate vocalizations with breathing.
Setting the pace in the brain
Recent studies have suggested that breathing can influence people’s performance on a surprisingly wide range of lab tests. Where someone is in the cycle of inhalation and exhalation can influence abilities as diverse as detecting a faint touch and distinguishing three-dimensional objects. One study found that people tend to inhale just before a cognitive task — and that doing so tends to improve performance. Several have found that it is only breathing through the nose that has these effects; breathing through the mouth does not.
One emerging idea about how this might work focuses on well-documented rhythmic oscillations of electrical activity in the brain. These waves, often measured with electrodes on the scalp, capture the cumulative activity of thousands of neurons, and for decades some neuroscientists have argued that they reflect communication between far-flung brain regions that could underlie important aspects of cognition. They could be, for example, how the brain integrates sensory information processed separately in auditory and visual parts of the brain to produce what we experience as a seamless perception of a scene’s sounds and sights. Some scientists have even proposed that such synchronized activity could be the basis of consciousness itself (needless to say, this has been hard to prove).
Growing evidence suggests breathing may set the pace for some of these oscillations. In experiments with rodents, several research teams have found that the breathing rhythm influences waves of activity in the hippocampus, a region critical for learning and memory. During wakefulness, the collective electrical activity of neurons in the hippocampus rises and falls at a consistent rate — typically between six and 10 times per second. This theta rhythm, as it’s called, occurs in all animals that have been studied, including humans.
Not only does the respiration rhythm synchronize activity in brain regions involved in emotion and memory, it can also affect people’s performance on tasks involving emotion and memory.
In a 2016 study, neuroscientist Adriano Tort at the Federal University of Rio Grande do Norte in Brazil and colleagues set out to study theta oscillations but noticed that their electrodes were also picking up another rhythm, a slower one with about three peaks per second, roughly the same as a resting mouse’s respiration rate. At first they worried it was an artifact, Tort says, perhaps caused by an unstable electrode or the animal’s movements. But additional experiments convinced them that not only was the rhythmic activity real and synched with respiration, but also that it acted like a metronome to set the pace for the faster theta oscillations in the hippocampus.
Around the same time, neuroscientist Christina Zelano and colleagues reported similar findings in humans. Using data from electrodes placed by surgeons on the brains of epilepsy patients to monitor their seizures, the researchers found that natural breathing synchronizes oscillations within several brain regions, including the hippocampus and the amygdala, an important player in emotional processing. This synchronizing effect diminished when the researchers asked subjects to breathe through their mouth, suggesting that sensory feedback from nasal airflow plays a key role.
Not only does the respiration rhythm synchronize activity in brain regions involved in emotion and memory, it can also affect people’s performance on tasks involving emotion and memory, Zelano and colleagues found. In one experiment they monitored subjects’ respiration and asked them to identify the emotion expressed by people in a set of photos developed by psychologists to test emotion recognition. Subjects were quicker to identify fearful faces when the photo appeared as they were taking a breath compared to during exhalation. In a different test, subjects more accurately remembered whether they’d seen a photo previously when it was presented as they inhaled. Again, the effects were strongest when subjects breathed through the nose.
More recent work suggests the respiratory rhythm could synchronize activity not just within but also between brain regions. In one study, neuroscientists Nikolaos Karalis and Anton Sirota found that the respiration rate synchronizes activity between the hippocampus and the prefrontal cortex in sleeping mice. This synchronization could play a role in making long-term memories, Karalis and Sirota suggest in a paper published earlier this year in Nature Communications. Many neuroscientists think memories initially form in the hippocampus before being transferred during sleep to the cortex for long-term storage — a process thought to require synchronized activity between the hippocampus and cortex.
For Tort, such findings suggest there may be important links between respiration and brain function, but he says more work is needed to connect the dots. The evidence that breathing influences brain oscillations is strong, he says. The challenge now is figuring out what that means for behavior, cognition and emotion.
Controlled breath, calm mind?
For millennia, practitioners of yoga and other ancient meditation traditions have practiced controlled breathing as a means of influencing their state of mind. In recent years, researchers have become increasingly interested in the biological mechanisms of these effects and how they might be applied to help people with anxiety and mood disorders.
One challenge has been separating the effects of breathing from other aspects of these practices, says Helen Lavretsky, a psychiatrist at UCLA. “It’s really hard to distinguish what’s most effective when you’re doing this multicomponent intervention where there’s stretching and movement and visualization and chanting,” she says. Not to mention the cultural and spiritual components many people attach to the practice.
For many years, Lavretsky has collaborated with neuroscientists and others to investigate how different types of meditation affect the brain and biological markers of stress and immune function. She has found, among other things, that meditation can improve performance on lab tests of memory and alter brain connectivity in older people with mild cognitive impairment, a potential precursor to Alzheimer’s disease and other types of dementia. In more recent studies, which have yet to be published, she’s moved toward investigating whether the breath control methods alone can help.
“Even though I’m a psychiatrist, my research is on how to avoid [prescribing] drugs,” says Lavretsky, who is also a certified yoga instructor. She thinks breathing exercises might be a good alternative for many people, especially with more research on which breathing techniques work best for which conditions and how they might be tailored to individuals. “We all have this tool, we just have to learn how to use it,” she says.
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