Sunday, 25 March 2018

Researchers uncover drain pipes in our brains


Researchers uncover drain pipes in our brains
By scanning the brains of healthy volunteers, researchers at the National Institutes of Health saw the first, long-sought evidence that our brains may drain some waste out through lymphatic vessels, the body’s sewer system. The results further suggest the vessels could act as a pipeline between the brain and the immune system.

“We literally watched people’s brains drain fluid into these vessels,” said Daniel S. Reich, M.D., Ph.D., senior investigator at the NIH’s National Institute of Neurological Disorders and Stroke (NINDS) and the senior author of the study published online in eLife. “We hope that our results provide new insights to a variety of neurological disorders.”

Source:
https://www.ninds.nih.gov/News-Events/News-and-Press-Releases/Press-Releases/NIH-researchers-uncover-drain-pipes-our-brains

Journal article:
https://elifesciences.org/articles/29738

#neuroimaging #lymphaticsystem #neurologicaldisorders #lymphaticdrainage #neuroscience

"Too often we underestimate the power of a touch, a smile, a kind word, a listening ear, an honest compliment, or...


"Too often we underestimate the power of a touch, a smile, a kind word, a listening ear, an honest compliment, or the smallest act of caring, all of which have the potential to turn a life around.”
~Leo F. Buscaglia

#personalnonsense #braingrip

Today marks 100 years since the death of Claude Debussy (1862-1918)


Today marks 100 years since the death of Claude Debussy (1862-1918)
Debussy was a French composer and is considered one of the most important figures working within the field of impressionist music during the 20th century. He is best known for Clair De Lune – composed around 1890 and published in 1905. Its original name was Promenade Sentimentale and is the third movement of Suite Bergamasque, one of the most revered piano suites of Debussy.

The title comes from a poem published in 1869 by the poet Paul Verlaine. The poem speaks of “au calme clair de lune triste et beau” (the still moonlight sad and lovely). Debussy’s music was a turning point from the Romantic music that had dominated the 19th century to the music of the 20th century.

Bio:
http://www.musicsalesclassical.com/composer/long-bio/Claude-Debussy

Listen to Clair de Lune:
https://www.youtube.com/watch?v=CvFH_6DNRCY

#history #Debussy #classicalmusic

Friday, 23 March 2018

Cognitive nexus


Cognitive nexus
When art and science come together ;)

Work by bigblueboo

#math #science #animation #processing

The Hindsgavl Dagger


The Hindsgavl Dagger
In the Neolithic period the flint workers achieved very high technical standards. The magnificent dagger from Hindsgavl with its blade less than 1 cm thick is the finest example of the flint workers’ outstanding skills at the end of the Stone Age. It was found around 1876 on the island Fænø in the Little Belt. The dagger type is called a ‘fishtail dagger’ because of the fishtail-formed hilt. Pressure-flaked daggers mark the beginning of the end of the Stone Age, and are the reason why the period from 2400-1800 BC is called the Dagger Period.

Reference:
https://en.natmus.dk/historical-knowledge/denmark/prehistoric-period-until-1050-ad/the-neolithic-period/the-hindsgavl-dagger/

#history #ancienthistory #flint #knives #daggers #flintknife

Why do we fall asleep when bored?


Why do we fall asleep when bored?
Losing yourself in your favorite things without sleeping, or falling asleep during boring lectures – As humans, we often defy sleepiness and stay awake when attention is necessary, but also experience an inescapable desire to sleep in boring situations. The brain mechanisms governing the regulation of sleep by cognitive and emotional factors are not well understood.

A new paper published in the journal Nature Communications finds that a part of the brain that is associated with motivation and pleasure - the nucleus accumbens - also can produce sleep. The new findings may explain why we have the tendency to fall asleep in the absence of motivating stimuli, i.e., when bored.

Researchers at the University of Tsukuba’s International Institute for Integrative Sleep Medicine (WPI-IIIS) and Fudan University’s Department of Pharmacology in the School of Basic Medical Sciences used chemo-genetic and optical techniques to remotely control the activities of nucleus accumbens neurons and the behaviors they mediate. As a result, the Japanese-Chinese team discovered that nucleus accumbens neurons have an extremely strong ability to induce sleep that is indistinguishable from the major component of natural sleep, known as slow-wave sleep, as it is characterized by slow and high-voltage brain waves.

“The classic somnogen adenosine is a strong candidate for evoking the sleep effect in the nucleus accumbens,” says Yo Oishi, the lead author on this project. Adenosine has long been known to represent a state of relative energy deficiency and to induce sleep via adenosine receptors. A specific subtype of adenosine receptors, the A2A receptors, are densely expressed in the nucleus accumbens. Caffeine, the most widely consumed psychostimulant in the world, produces its arousal effect also in the nucleus accumbens by blocking A2A receptors. Compounds that activate A2A receptors in the nucleus accumbens may open safe therapeutic avenues for treating insomnia, which is one of the most common sleep problems with an estimated prevalence of 10-15% in the general population and 30-60% in the older population.

Source:
https://wpi-iiis.tsukuba.ac.jp/resource/1_en/2017/10/pr20170929_en.pdf

#nucleusaccumbens #sleep #adenosine #insomnia #neuroscience

Saturday, 17 March 2018

Asteroseismology reveals the structure of a white dwarf


Asteroseismology reveals the structure of a white dwarf
Using asteroseismology, scientists can analyze stars' intrinsic pulsations to tease out the physical properties of stellar interiors. Now scientists have applied asteroseismology to unmask a white dwarf—a star in the slow cooling phase that marks the end of the life cycle of all but the most massive stars. The results confirm the broad contours of stellar evolution theory but significantly challenge the particulars.

Article:
https://physicstoday.scitation.org/doi/10.1063/PT.3.3862

Photo:
A white dwarf undergoing a nova explosion, as observed by NASA’s Chandra X-Ray Observatory.

#physics #science #research #asteroseimology

Seeing sounds: researchers uncover molecular clues for synaesthesia


Seeing sounds: researchers uncover molecular clues for synaesthesia
Do you taste or smell colors? See colors when listening music...or perhaps you can see digits and letters floating and in vivid colors like me ;) If so, this article is for you.

One in twenty-five people have synaesthesia, perceiving the world in unusual ways. An experience with one sense automatically leads to perception in another sense: for example, seeing colors when listening to music. Now researchers at the Max Planck Institute for Psycholinguistics and the University of Cambridge report clues into biological origins of such variations in human perception. They studied families with synaesthesia, and describe genetic changes that might contribute to their differences in sensory experience.

“Brain imaging of adults with synaesthesia suggests that their circuits are wired a little differently compared to people who don't make these extra sensory associations. What we don’t know yet is how these differences develop,” said Dr. Amanda Tilot, a geneticist at the Max Planck Institute for Psycholinguistics. “We suspect some of the answers lie in people's genetic makeup.”

Read the article:
https://www.mpg.de/11964360/seeing-sounds-researchers-uncover-molecular-clues-for-synaesthesia

To better understand these findings, the team is looking for new families and individuals to join their study. You can take a short online test to find out if you experience a common form of synaesthesia.
http://www.mpi.nl/departments/language-and-genetics/projects/decoding-the-genetics-of-synaesthesia/genetics-of-synaesthesia

#neuroscience #synaesthesia #research #brain

Child abuse affects brain wiring


Child abuse affects brain wiring
Researchers from the McGill Group for Suicide Studies, based at the Douglas Mental Health University Institute and McGill University’s Department of Psychiatry, have published research in the American Journal of Psychiatry that suggests that the long-lasting effects of traumatic childhood experiences, like severe abuse, may be due to an impaired structure and functioning of cells in the anterior cingulate cortex. This is a part of the brain which plays an important role in the regulation of emotions and mood.

The researchers believe that these changes may contribute to the emergence of depressive disorders and suicidal behaviour.

Crucial insulation for nerve fibers builds up during first two decades of life
For the optimal function and organization of the brain, electrical signals used by neurons may need to travel over long distances to communicate with cells in other regions. The longer axons of this kind are generally covered by a fatty coating called myelin. Myelin sheaths protect the axons and help them to conduct electrical signals more efficiently. Myelin builds up progressively (in a process known as myelination) mainly during childhood, and then continue to mature until early adulthood.

Earlier studies had shown significant abnormalities in the white matter in the brains of people who had experienced child abuse. (White matter is mostly made up of thousands of myelinated nerve fibres stacked together.) But, because these observations were made by looking at the brains of living people using MRI, it was impossible to gain a clear picture of the white matter cells and molecules that were affected.

To gain a clearer picture of the microscopic changes which occur in the brains of adults who have experienced child abuse, and thanks to the availability of brain samples from the Douglas-Bell Canada Brain Bank (where, as well as the brain matter itself there is a lot of information about the lives of their donors) the researchers were able to compare post-mortem brain samples from three different groups of adults: people who had committed suicide who suffered from depression and had a history of severe childhood abuse (27 individuals); people with depression who had committed suicide but who had no history of being abused as children (25 individuals); and brain tissue from a third group of people who had neither psychiatric illnesses nor a history of child abuse (26 people).

Impaired neural connectivity may affect the regulation of emotions
The researchers discovered that the thickness of the myelin coating of a significant proportion of the nerve fibers was reduced ONLY in the brains of those who had suffered from child abuse. They also found underlying molecular alterations that selectively affect the cells that are responsible for myelin generation and maintenance. Finally, they found increases in the diameters of some of the largest axons among only this group and they speculate that together, these changes may alter functional coupling between the cingulate cortex and subcortical structures such as the amygdala and nucleus accumbens (areas of the brain linked respectively to emotional regulation and to reward and satisfaction) and contribute to altered emotional processing in people who have been abused during childhood.

The researchers conclude that adversity in early life may lastingly disrupt a range of neural functions in the anterior cingulate cortex. And while they don’t yet know where in the brain and when during development, and how, at a molecular level these effects are sufficient to have an impact on the regulation of emotions and attachment, they are now planning to explore this in further research.

Source
http://www.mcgill.ca/newsroom/channels/news/child-abuse-affects-brain-wiring-270024

Journal article:
https://ajp.psychiatryonline.org/doi/abs/10.1176/appi.ajp.2017.16111286?journalCode=ajp

#cingulatecortex #myelin #childabuse #emotionregulation #whitematter #neuroscience

Theory of everything


Theory of everything
If you're lucky enough to find love, remember it is there and don't throw it away.

Work by bigblueboo

#math #StephenHawking #animation

One of the most important


One of the most important
milestones I ever reached in my life
was accepting that people
won’t always love you the way you
want them to.
~BT

#personalnonsense

Wednesday, 14 March 2018

ADHD Kids Can Be Still – If They’re Not Straining Their Brains


ADHD Kids Can Be Still – If They’re Not Straining Their Brains
How’s this for exasperating: Your ADHD child fidgets and squirms his way through school and homework, but seems laser-focused and motionless sitting in front of the TV watching an action thriller.

Well, fret not, because new research shows lack of motivation or boredom with school isn’t to blame for the differing behavior. It turns out that symptoms of Attention Deficit Hyperactivity Disorder such as fidgeting, foot-tapping and chair-swiveling are triggered by cognitively demanding tasks – like school and homework. But movies and video games don’t typically require brain strain, so the excessive movement doesn’t manifest.

“When a parent or a teacher sees a child who can sit perfectly still in one condition and yet over here they’re all over the place, the first thing they say is, ‘Well, they could sit still if they wanted to,’” said Mark Rapport, director of the Children’s Learning Clinic at the University of Central Florida. “But kids with ADHD only need to move when they are accessing their brain’s executive functions. That movement helps them maintain alertness.”

Scientists once thought that ADHD symptoms were always present. But previous research from Rapport, who has been studying ADHD for more than 36 years, has shown the fidgeting was most often present when children were using their brains’ executive functions, particularly “working memory.” That’s the system we use for temporarily storing and managing information required to carry out complex cognitive tasks such as learning, reasoning and comprehension.

As recently published in the Journal of Abnormal Child Psychology, Professor Rapport’s senior doctoral student Sarah Orban and research team tested 62 boys ages 8 to 12. Of those, 32 had ADHD. Thirty did not have ADHD and acted as a control group.

During separate sessions, the children watched two short videos, each about 10 minutes long. One was a scene from “Star Wars Episode I – The Phantom Menace” in which a young Anakin Skywalker competes in a dramatic pod-race. The other was an instructional video featuring an instructor verbally and visually presenting multistep solutions to addition, subtraction and multiplication problems.

While watching, the participants were observed by a researcher, recorded and outfitted with wearable actigraphs that tracked their slightest movements. The children with ADHD were largely motionless while watching the Start Wars clip, but during the math video they swiveled in their chairs, frequently changed positions and tapped their feet.

That may not seem surprising. After all, weren’t the children absorbed by the sci-fi movie and bored by the math lesson? Not so, Rapport said.

“That’s just using the outcome to explain the cause,” he said. “We have shown that what’s really going on is that it depends on the cognitive demands of the task. With the action movie, there’s no thinking involved – you’re just viewing it, using your senses. You don’t have to hold anything in your brain and analyze it. With the math video, they are using their working memory, and in that condition movement helps them to be more focused.”

The takeaway: Parents and teachers of children with ADHD should avoid labeling them as unmotivated slackers when they’re working on tasks that require working memory and cognitive processing, researchers said.

The study builds on Rapport’s earlier research, including a 2015 study that found that children with ADHD must be allowed to squirm to learn.

Source:
https://today.ucf.edu/adhd-kids-can-still-theyre-not-straining-brains/

Journal article:
https://link.springer.com/article/10.1007/s10802-017-0338-x

#ADHD #workingmemory #neuroscience

Tuesday, 13 March 2018

RIP Stephen Hawking


RIP Stephen Hawking
Intelligence is the ability to adapt to change.

World renowned physicist Stephen Hawking has died at the age of 76. He died peacefully at his home in Cambridge in the early hours of Wednesday, his family said. The Briton was known for his work with black holes and relativity, and wrote several popular science books including A Brief History of Time.

Article:
https://www.nytimes.com/2018/03/14/obituaries/stephen-hawking-dead.html
http://www.bbc.com/news/uk-43396008

#history #StephenHawking

Happy Pi Day!


Happy Pi Day!
Pi is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159.

Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern. While only a handful of digits are needed for typical calculations, Pi’s infinite nature makes it a fun challenge to memorize, and to computationally calculate more and more digits.

Article:
https://www.space.com/39962-2018-pi-in-the-sky-nasa-challenge.html

#PiDay2018 #math #science

Monday, 12 March 2018

“Logic is the most useful tool of all the arts. Without it no science can be fully known.”


“Logic is the most useful tool of all the arts. Without it no science can be fully known.”
William of Ockham, Summa Logicae

#wordsofwisdom

Fast Stars and Rogue Planets in the Orion Nebula


Fast Stars and Rogue Planets in the Orion Nebula
Start with the constellation of Orion. Below Orion's belt is a fuzzy area known as the Great Nebula of Orion. In this nebula is a bright star cluster known as the Trapezium, marked by four bright stars near the image center. The newly born stars in the Trapezium and surrounding regions show the Orion Nebula to be one of the most active areas of star formation to be found in our area of the Galaxy.

In Orion, supernova explosions and close interactions between stars have created rogue planets and stars that rapidly move through space. Some of these fast stars have been found by comparing different images of this region taken by the Hubble Space Telescope many years apart. Many of the stars in the featured image, taken in visible and near-infrared light, appear unusually red because they are seen through dust that scatters away much of their blue light.

Image & info via APOD
https://apod.nasa.gov/apod/ap170321.html
Image Credit: NASA, ESA, Hubble

#NASA #ESA #Hubble #space #universe #science

Monday, 5 March 2018

Small Bursts


Small Bursts
A relatively small active region erupted twice in 18 hours (Mar. 2, 2018). After each burst, one can see the magnetic fields lines, which appear as bright coils, spiraling around the region. They are reorganizing the disrupted magnetic field. The quick second when the screen goes black was caused by the Earth passing between the spacecraft and the sun. Images were taken in a wavelength of extreme ultraviolet light.

Credit Solar Dynamics Observatory, NASA.
https://sdo.gsfc.nasa.gov/gallery/potw/item/880

#sun #universe #solaractivity #science #space

Why Bad Sleep Doesn’t Always Lead to Depression


Why Bad Sleep Doesn’t Always Lead to Depression
Poor sleep is both a risk factor, and a common symptom, of depression. But not everyone who tosses and turns at night becomes depressed.

Individuals whose brains are more attuned to rewards may be protected from the negative mental health effects of poor sleep, says a new study by Duke University neuroscientists.

The researchers found that college students with poor quality sleep were less likely to have symptoms of depression if they also had higher activity in a reward-sensitive region of the brain.

“This helps us begin to understand why some people are more likely to experience depression when they have problems with sleep,” said Ahmad Hariri, a professor of psychology and neuroscience at Duke University. “This finding may one day help us identify individuals for whom sleep hygiene may be more effective or more important.”

The paper appeared online Sept. 18 in the Journal of Neuroscience.

Source & further reading:
https://today.duke.edu/2017/09/why-bad-sleep-doesn%E2%80%99t-always-lead-depression

Journal article:
http://www.jneurosci.org/content/early/2017/09/18/JNEUROSCI.1734-17.2017

Image:
Higher activity in the ventral striatum, the brain’s reward center, may buffer some individuals against the negative mental health effects of poor sleep.
Credit: Annchen R. Knodt

#sleep #depression #ventralstriatum #brainfunction #neuroscience #research

Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.


Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.
~ Arthur C. Clarke

#wordsofwisdom

Colorful Airglow Bands Surround Milky Way


Colorful Airglow Bands Surround Milky Way
Why would the sky glow like a giant repeating rainbow? Airglow. Now air glows all of the time, but it is usually hard to see. A disturbance however -- like an approaching storm -- may cause noticeable rippling in the Earth's atmosphere.

These gravity waves are oscillations in air analogous to those created when a rock is thrown in calm water. Red airglow likely originates from OH molecules about 87-kilometers high, excited by ultraviolet light from the Sun, while orange and green airglow is likely caused by sodium and oxygen atoms slightly higher up.

While driving near Keluke Lake in Qinghai Provence in China, the photographer originally noticed mainly the impressive central band of the Milky Way Galaxy. Stopping to photograph it, surprisingly, the resulting sensitive camera image showed airglow bands to be quite prominent and span the entire sky. The featured image has been digitally enhanced to make the colors more vibrant.

Image & info via APOD
https://apod.nasa.gov/apod/astropix.html
Image Credit & Copyright: Xiaohan Wang

#naturalphenomena #airglow space #NASA #universe #science

Thursday, 1 March 2018

Scientists list 50 terms you may be confusing


Scientists list 50 terms you may be confusing
Should you punish a disobedient child, or try negative reinforcement? Is your shy new colleague antisocial or asocial? And which is worse: a prejudiced boss or a discriminatory one?

A new paper published in Frontiers in Education defines 50 such “term pairs” related to psychology. As the most comprehensive list of its kind, the paper aims to improve the psychological literacy of psychology students as well as the broader public.

“Words matter, and science is no exception,” says Scott O. Lilienfeld, professor of psychology at Emory University, USA, and one of the paper’s authors. “All sciences rely on specialized terminology which must be correctly understood to master the field’s core concepts.”

“In psychology, many terms are confused not only by new students but also by advanced students, psychology instructors, and science journalists. These misunderstandings can impede the learning of other psychological ideas.”

The paper, “50 Differences That Make a Difference: A Compendium of Frequently Confused Term Pairs in Psychology”, follows an earlier list of 50 widely used psychological terms that should generally be avoided.

Here’s a short definition of the term pairs above:

1. Negative reinforcement involves the withdrawal of a stimulus and increases the likelihood of a previous behavior, while punishment involves the presentation of a stimulus and decreases the likelihood of a previous behavior. So if you want to lower the likelihood of further disobedience, punishment is the way to go (although most psychological research suggests that punishment works well in the short-term, but not in the long-term).

2. Your new colleague is most likely asocial. Antisocial people perform actions against others, frequently engaging in reckless, irresponsible, and at times illegal behaviors. In contrast, asocial people chronically withdraw from others due to shyness or not being interested in interpersonal contact.

3. Prejudice refers to a belief, discrimination to a behavior. Specifically, prejudice means arriving at a premature – and usually negative – judgment of others based on their membership in one or more categories (e.g., African-American, Jew, obese, Republican), whereas discrimination refers to the act of treating others poorly as a function of this membership. While both are bad, you’d probably prefer that your boss be prejudiced.

4. Race refers to a class, such as Caucasian or African-American, that is defined by biological differences such as white versus brown or black skin. Ethnicity is a broader concept, such as German or Chinese-American, that includes race as well as cultural variables such as country of origin, customs, and preferred language.

5. Envy and jealousy are so frequently confused (e.g., “I’m jealous that you’re going to Hawaii next week!”) that few people are aware they differ. Yet the distinction is typically simple: Envy involves two people, whereas jealousy involves three or more people. So you are envious, not jealous, that your friend is headed to Hawaii — unless they are going with another friend as well.

6. A serial killer kills multiple people in a string of incidents that are separated by “cooling off” periods, whereas a mass murderer kills a large number of people in a single incident. Serial killers are also different from spree killers, whose homicidal episodes are not separated by clear-cut cooling-off periods.

7. According to most sociologists and cultural anthropologists, disease is the specific pathology or malfunctioning of a body part, and illness is the afflicted individual’s reactions to the disease.

Other widely confused terms listed in the paper include:

“Conformity” versus “obedience.” Both terms refer to forms of social influence but differ in at least two ways. In conformity, the direction of social influence is “horizontal” from one or more peers to an individual, whereas in obedience the direction is “vertical” from one or more authority figures to an individual. Moreover, in conformity, the influence is typically implicit (unspoken), whereas in obedience, it is typically explicit.

“Sex” versus “gender.” The latest edition of the American Psychological Association’s style manual reserves “sex” for biological differences and “gender” for social differences. For example, when referring to men and women in the context of socially defined groups, one should typically use gender, not sex.

“Anxiety” versus “fear.” Although many use these terms interchangeably, there is evidence that they differ both psychologically and physiologically. Anxiety is associated with negative affect in the presence of an ambiguous and potentially avoidable threat, whereas fear is associated with negative affect in the presence of an imminent and largely unavoidable threat. Even after the threat is gone, anxiety tends to persist whereas fear tends to diminish or disappear.

“Empathy” versus “sympathy.” Most authors define empathy as the capacity to appreciate or grasp the emotions of others. In sympathy, the individual typically experiences concern or compassion for the other person but does not necessarily have the same emotional experience.

“Repression” versus “suppression.” In psychoanalytic lingo, repression is a defense mechanism marked by the unconscious motivated forgetting of unpleasant material. In contrast, suppression is a defense mechanism marked by the conscious forgetting of this material.

“Shame” versus “guilt.” Most research suggests that shame reflects a global negative evaluation of oneself following a problematic or unethical behavior (“I am bad”), whereas guilt reflects a more specific negative evaluation of this behavior (“I did a bad thing”).

“Delusion” versus “hallucination.” These terms are widely confused in popular culture and occasionally in peer-reviewed literature as well. Delusions are fixed false beliefs that are not widely shared by members of the individual’s culture or subculture, whereas hallucinations are perceptual experiences that occur in the absence of any sensory stimulation.

“Obsession” versus “compulsion.” According to the latest edition of the American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorders (DSM), obsessions are “recurrent and persistent thoughts urges or images that are experienced as intrusive or unwanted” whereas compulsions are “repetitive behaviors or mental acts that an individual feels driven to perform in response to an obsession or according to rules that must be applied rigidly”.

“Schizophrenia” versus “multiple personality disorder.” These terms are very often misused in popular culture, following the incorrect formula of “multiple personality = split personality = schizophrenia”. Schizophrenia is characterized by a severe splitting of functions, such as cognition, emotion, and motivation, within a single person. In multiple personality disorder, now termed dissociative identity disorder, the individual’s mind ostensibly harbors two or more distinct “alters,” that is, personalities or “personality states.”

“Symptom” versus “sign.” Symptoms are subjective and must be reported by patients, whereas signs are largely objective and can be observed by clinicians and others.

“Transgender” versus “transvestite.” A transgendered person possesses a gender identity that differs from his or her biological sex, while a transvestite is someone who dresses in clothing that differs from that traditionally worn by members of his or her biological sex.

“Prevalence” versus “incidence.” Prevalence refers to the proportion of individuals in a population with a given condition. Incidence refers to the rate of emergence of new cases of individuals with a condition over a specified time interval.

“Risk factor” versus “cause.” A risk factor is a variable that (a) precedes the onset of a disorder and (b) is associated with a heightened likelihood of developing this disorder. Nevertheless, not all risk factors are causal risk factors. For example, although attentional dysfunction often precedes the onset of schizophrenia and is statistically associated with this condition, it may not itself contribute to schizophrenia. In contrast, the death of a loved one appears to both precede, and be causally related to risk for, the onset of major depression.

“Coma” versus “persistent vegetative state.” People in a coma are unable to respond to external stimulation, such as light or sound; cannot be awakened, respond to verbal commands, or initiate purposeful actions; and lack a normal sleep-wake cycle. People in a persistent vegetative state (PVS; recently renamed unresponsive wakefulness syndrome) lack normal awareness of the self and environment, but retain the sleep-wake cycle as well as certain reflexes and automatic responses such as yawning, grimacing, moaning, and opening eyes during feeding. The person’s level of consciousness may also vary in response to stimulation. A coma typically lasts less than a month, after which the person emerges with no or varying degrees of brain damage. In contrast, a PVS can last for many years and cause permanent cognitive and functional disability.

“Testing” versus “assessment.” Psychological testing refers to administration of self-report indices, interviews, intelligence tests and other measures to individuals. Psychological assessment refers to the integration and interpretation of test scores, almost always in conjunction with other information (e.g., life history data, behavioral observations during testing) to draw inferences concerning the individual’s mental status.

Source:
https://blog.frontiersin.org/2017/09/19/frontiers-in-education-science-communication/

See the original paper for a full definition of all 50 terms:
https://www.frontiersin.org/articles/10.3389/feduc.2017.00037/full

#psychologicalterms #psychology #psychiatry #psychopathology #neuroscience #medicine

A Tantalizing Signal From the Early Universe


A Tantalizing Signal From the Early Universe
The astronomy community is buzzing over radio telescope measurements that could indicate radiation from the universe's first stars, a mere 180 million years after the Big Bang. The signal, detected by radio antennae situated in the Australian desert, does not match theoretical predictions of what those early stellar signatures would look like.

That's both exciting and worrying: It could mean that hydrogen atoms in the early universe were interacting with cold, lightweight particles of dark matter. But it also could mean that the signal is the result of instrument calibration errors or other factors. Other radio observatories should be able to chime in over the next couple of years to confirm or refute the new results.

Source:
https://www.insidescience.org/news/astronomers-catch-faint-message-universe%E2%80%99s-first-stars

Journal article (under paywall):
https://www.nature.com/articles/nature25792

Image:
This handout photo released by Nature on February 28, 2018 shows a timeline of the universe, updated to show when the first stars emerged reflecting a recent discovery by researchers at Arizona State University that the first stars emerged by 180 million years after the Big Bang.

#physics #universe #BigBang #science #astronomy #research