Category: Brain

Brain, Perception May 27, 2020

Gradual Hearing Loss “Reorganises” Brain’s Sensory Areas And Impairs Memory (In Mice)

In 2011, a US-based study published in the Journal of the American Medical Association found that people with hearing loss were more likely to develop dementia. This alarming result prompted a number of follow-up studies, which have substantiated the link and further explored the risk. But the mechanism of how hearing loss raises this risk has not been clear.

Now a new study, by a team at Ruhr University Bochum in Germany, offers an explanation. The researchers found that gradual hearing loss (the sort commonly experienced into older age) “profoundly” alters normal processes in the brain’s cortex and hippocampus, and that this impairs memory. This work was conducted on mice, not humans. But it provides useful new insights into what might happen in people.

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Brain, Music March 23, 2020July 13, 2020

Musicians And Their Audiences Show Synchronised Patterns Of Brain Activity

By Emma Young

When a musician is playing a piece, and the audience is enjoying it, they can develop physical synchronies. Both might tap their feet, sway their bodies, or clap their hands. “Through music, the producer and the perceiver connect emotionally and behaviourally,” note the authors of a new paper, published in NeuroImage. And now this team, led by Yingying Hou at East China Normal University, has uncovered a connection right down at the neural level. The team has observed “inter-brain coherence” (IBC) — a synchronisation in brain activity — between a musician and the audience. What’s more, the strength of this coherence could be used to predict how much the audience enjoyed a piece.

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Brain, Emotion March 5, 2020March 11, 2020

Emotions Are Represented In The Brain In A Surprisingly Similar Way To Visual Information, Study Argues

By Emma Young

Love it or loathe it, Forrest Gump has now gone way beyond introducing “Life is like a box of chocolates” and “Run, Forrest! Run!” into our vernacular. It’s been used to do something truly remarkable: to reveal the location of a map of emotions in the human brain.

This new work, published in Nature Communications, shows that a spherical bit of cortex, about three centimetres in diameter, represents not only the kind of emotion we’re feeling in any given moment, but how strongly we’re feeling it. In revealing objective brain-based correlates of our feelings, the work potentially has all kinds of implications for psychiatry. Continue reading “Emotions Are Represented In The Brain In A Surprisingly Similar Way To Visual Information, Study Argues” →

Brain, bullying, Developmental February 26, 2020March 11, 2020

Bullies And Their Victims Show Different Patterns Of Brain Activity To Emotional Faces

By Emma Young

An estimated one quarter to one half of adolescents will at some point either be a victim of bullying, or engage in it — or both. Whether you’re on the receiving end, or dealing it out, there are all kinds of associated negative implications for mental health and well-being, including distress, depression and anxiety. “This highlights an important need to understand the predictors of bullying and victimisation, in order to identify ways to reduce these experiences in adolescents,” write the researchers behind a new study, published in Social Cognitive and Affective Neuroscience. And this research has revealed one such factor: both bullies and victims show differences in the brain’s response to angry and fearful faces.

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Brain, Emotion, guest blogger, Sleep and dreaming November 21, 2019November 21, 2019

A Lack Of Sleep Causes Anxiety — But Don’t Worry About It

By guest blogger Freddy Parker

How did you sleep last night? If the answer is “badly” followed by an uninvited pang of anxiety, look no further for an explanation than a study published this month in Nature Human Behaviour.

A lack of sleep is known to lead to feelings of anxiety, even among healthy people. But the new paper reveals that the amount of “deep” or slow-wave sleep is most pertinent to this relationship. That, the authors conclude, is because slow-wave brain oscillations offer an “ameliorating, anxiolytic benefit” on brain networks associated with emotional regulation.

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Brain, Perception October 4, 2019October 8, 2019

Harsh Sounds Like Screams Hijack Brain Areas Involved In Pain And Aversion, Making Them Impossible To Ignore

By Emma Young

You see a pedestrian about to step out in front of an oncoming car. Is it better to calmly call out a warning, or to scream?

Of course, it’s better to scream — but not just because a scream is loud. Car alarms, police sirens and smoke alarms are all loud, too. But, like screams, they also feature fast but perceptible fluctuations in loudness, usually at frequencies of between 40 and 80 Hz, making them acoustically “rough”. Quite why such sounds should be so attention-grabbing, and even unbearable, hasn’t been clear. Now a team led by Luc Arnal at the University of Geneva has found that this type of sound triggers activity in brain areas related not just to hearing but also to aversion and to pain. This makes them impossible to ignore.

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Brain, Reading September 25, 2019

Our Brains Represent The Meaning Of Words the Same Way Whether We Read Them Or Hear Them

By Emma Young

In an era of TED talks, podcasts, and audiobooks, it’s easy to choose to listen to factual information or fiction, rather than to read it. But is that a good thing? Are there any differences in the way the brain processes the meaning of words that are heard rather than read? According to the researchers behind a thorough new study, published in the Journal of Neuroscience, the answer to this last question is “no”. But it may still be too soon to conclude that listening to an audiobook is effectively the same as reading it.

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Brain, Methods August 19, 2019

Left-Handed People Are Being Unnecessarily Excluded From Neuroimaging Research, Study Finds

By Matthew Warren

In a world made for right-handed people, life can sometimes be frustrating if you are among the 10% or so who are “adextral” — that is, left-handed or ambidextrous. Now a new grievance can be added to the list. Brain imaging researchers are systematically excluding adextrals from participating in their studies, according to an analysis of recent research papers published in top neuroimaging journals. Yet there’s no good reason to exclude this population, say the authors — and in fact, the practice could be detrimental to research.

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Brain, Mental health, Psychosis June 24, 2019June 24, 2019

A Key Brain Difference Between Voice-Hearing Patients And Voice-Hearing Healthy Controls Challenges The “Continuum Model”

Screenshot 2019-06-24 at 12.07.36.png — Via Garrison et al, 2019

By Christian Jarrett

Hearing voices that don’t exist in the outside world is the most common form of hallucination experienced by people with a diagnosis of schizophrenia or related conditions and it can be very distressing. However, there is a growing recognition that hearing voices is not always pathological. Many mentally well people hear voices (or “auditory verbal hallucinations”) – in fact, around 6-7 per cent of adults in the general population report having had such experiences at some point in their lives.

This has led some experts to propose a “continuum model” in which the same fundamental underlying mechanism leads to hearing voices in healthy people and in patients with a clinical diagnosis, but that for various reasons, such as a traumatic past, the experience is more troublesome and distressing for the patients. However, a new open-access paper in Schizophrenia Bulletin challenges the continuum model, finding an important brain difference between patients who hear voices and voice-hearing healthy controls.

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