Category: Brain

Brain, Drugs, Mental health

Psilocybin Alters Brain Levels Of The Neurotransmitter Glutamate — And This Could Explain Why Users Experience “Ego Dissolution”

By Emma Young

Recent therapeutic trials of “classical” psychedelic drugs, such as psilocybin (from magic mushrooms) or LSD, have reported benefits to wellbeing, depression and anxiety. These effects seem to be linked to a sense of “ego dissolution” — a dissolving of the subjective boundaries between the self and the wider world. However, the neurochemistry behind this effect has been unclear. Now a new paper, published in Neuropsychopharmacology, suggests that changes in brain levels of the neurotransmitter glutamate are key to understanding reports of ego dissolution — and perhaps the therapeutic effects of psychedelics.

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Babies, Brain, Social

Parents Have More Synchronised Patterns Of Brain Activity When They’re Together

By Emily Reynolds

It’s an oft-repeated supposition that you can tell whether someone fancies you by their body language: if they mirror how you’re standing or moving, the theory goes, they might just like you back. But romantic partners don’t just have behavioural synchrony — in some cases, they have brain-to-brain synchrony too.

A pattern that has also been observed in musicians and their audiences, brain-to-brain synchrony is a mirroring of neural activity between individuals or groups. And according to a new study in Scientific Reports, such synchrony in spouses could affect how they respond to their children.

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Brain, Perception

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

By Emma Young

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

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

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

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, Personality, Social, The self

When Thinking About Your Personality, Your Friends’ Brain Activity Is Surprisingly Similar To Your Own

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By Emma Young

How well do you know your best friend? New research led by Robert Chavez at the University of Oregon suggests that scans of both your brains might provide the answer. The study, published in the Journal of Personality and Social Psychology: Attitudes and Social Cognition, reveals that the brain activity patterns of people asked to think about what a mutual friend is like can be remarkably similar to those observed in that friend when they think about themselves.

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Brain, Emotion, guest blogger, Sleep and dreaming

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

Man having problems/ insomnia, laying in bed

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

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

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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

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

Enjoying the music and reading a book

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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