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The human brain is the center of the human nervous system and is a highly complex organ. Enclosed in the cranium, it has the same general structure as the brains of other mammals, but is over three times as large as the brain of a typical mammal with an equivalent body size.

Physically fit individuals may better cope with dehydration stress

Individuals who are physically fit may be better equipped to handle the negative effects of dehydration, according to research from the University of California, Riverside. In a study using selectively bred "high-runner" mice, the scientists found that fitter animals increased their voluntary running activity when deprived of water - a finding that could have implications for human performance and health under environmental stress.

23 Oct 2025

How psychedelics profoundly reshape the perception of time and consciousness

A perspective article published in Psychedelics by Prof. Xiaohui Wang and colleagues examines how psychedelic substances profoundly reshape the perception of time, offering unprecedented insights into consciousness and potential therapeutic applications.

23 Oct 2025

When a hearing aid isn’t enough

Kitty Grutzmacher had contended with poor hearing for a decade, but the problem had worsened over the past year. Even with her hearing aids, "there was little or no sound," she said.

23 Oct 2025

Hunger and hormones drive aggression in mice

Researchers at the Francis Crick Institute have found that hunger can make virgin female mice aggressive towards pups, but only in certain hormonal states.

22 Oct 2025

New computer model lets researchers simulate how brain circuits make decisions

Every day, your brain makes thousands of decisions under uncertainty. Most of the time, you guess right. When you don't, you learn. But when the brain's ability to judge context or assign meaning falters, thoughts and behavior can go astray.

22 Oct 2025

Understanding the neural mechanisms behind food choices

Feeding in mammals is controlled by a complex neural system. Although several key neural pathways related to total calorie intake have been extensively studied, it is still unclear how food choices are regulated and how they influence overall feeding behavior.

22 Oct 2025

Repeated ketamine infusions offer no extra benefit for people hospitalized with depression

Findings from a randomized and blinded clinical trial investigating repeated ketamine infusions for treating depression have revealed no extra benefit for ketamine when added onto standard care for people admitted to hospital for depression.

22 Oct 2025

Dreams happen beyond REM sleep, analysis shows

An international consortium of researchers has created the largest-ever database compiling records of brain activity during sleep and dream reports.

22 Oct 2025

Updated CPR guidelines provide expanded recommendations for managing choking and opioid overdose

The "2025 American Heart Association Guidelines for Cardiopulmonary Resuscitation (CPR) and Emergency Cardiovascular Care (ECC)," published today in the Association's flagship journal, Circulation, marks the first full revision of lifesaving resuscitation guidance since 2020.

22 Oct 2025

People with multiple sclerosis found to have dysbiotic oral microbiome

With ads everywhere for pro- or pre-biotic foods and supplements, most people are familiar with the gut microbiome-the trillions of bacteria, fungi, and viruses that colonize our digestive tract-and the idea that keeping our gut microbiome healthy improves our overall health.

22 Oct 2025

Research reveals how signs of dyslexia can be detected in newborns' brains

Brain research can provide valuable information about children who may need extra support before they start struggling with reading in the classroom.

22 Oct 2025

Oral targeted therapy shrinks tumors in over 70% of patients with HER2-mutant NSCLC

The oral targeted therapy sevabertinib led to tumor reduction and manageable side effects in patients with HER2-mutant non-small cell lung cancer (NSCLC), according to data from a trial led by researchers at The University of Texas MD Anderson Cancer Center.

22 Oct 2025

Study shows mRNA-based COVID vaccines enhance effectiveness of immune checkpoint therapy

Patients with cancer who received mRNA-based COVID vaccines within 100 days of starting immune checkpoint therapy were twice as likely to be alive three years after beginning treatment, according to a new study led by researchers at The University of Texas MD Anderson Cancer Center.

22 Oct 2025

Night shift work may raise risk of irritable bowel syndrome

The study indicates that night shift work increases irritable bowel syndrome risk, particularly among those with obesity, due to circadian rhythm disturbances.

22 Oct 2025

Scientists question the safety and efficacy of the diet for metabolic health

A study published in Science Advances by University of Utah Health researchers sheds light on the long-term effects of the ketogenic diet, raising important questions about its safety and efficacy for improving metabolic health.

22 Oct 2025

Noninvasive optical system measures blood flow with precision

Measuring how well blood flows to the brain is crucial for understanding a wide range of neurological issues, from strokes to migraines to traumatic brain injuries. Obtaining such measurements noninvasively, however, remains a challenge. The scalp and skull not only obstruct viewing the brain directly but also have their own blood supply, further complicating cerebral blood flow measurements.

22 Oct 2025

Fortress, filter, and gatekeeper: New insights into how the blood-brain barrier safeguards the brain

Researchers provide a comprehensive overview of the blood-brain barrier (BBB), detailing its cellular architecture, transport mechanisms, and role in protecting the brain from toxins. The paper highlights how BBB dysfunction contributes to neurological diseases and explores emerging technologies to overcome drug delivery challenges.

21 Oct 2025