Daily or “circadian” rhythms including the sleep wake cycle, and rhythms in hormone release are controlled by a molecular clock that is present in every cell of the human body. This human clock has its own inbuilt, default rhythm of almost exactly 24 hours that allows it to stay finely tuned to the daily cycle generated by the rotation of Earth. This beautiful symmetry between the human clock and the daily cycle of Earth’s rotation is disrupted by exposure to artificial light cycles, and by irregular meal, work and sleep times. This mismatch between the natural circadian rhythms of our bodies and the environment is called “circadian desynchrony.”

“Electric light allowed humans to override an ancient synchronization between the rhythm of the human clock and the environment, and over the last century, daily rhythms in meal, sleep and working times have gradually disappeared from our lives … The human clock struggles to remain tuned to our highly irregular lifestyles, and I believe that this causes metabolic and other health problems, and makes us more likely to become obese." - Dr. Cathy Wyse (Chronobiology research group, University of Aberdeen)

A new study by researchers at UT Dallas and the University of Michigan has found that the strength of communication between the left and right hemispheres of the brain predicts performance on basic arithmetic problems.  The findings shed light on the neural basis of human math abilities and suggest a possible route to aiding those who suffer from dyscalculia— an inability to understand and manipulate numbers.

It has been known for some time that the parietal cortex, the top/middle region of the brain, plays a central role in so-called numerical cognition—our ability to process numerical information. Previous brain imaging studies have shown that the right parietal region is primarily involved in basic quantity processing (like gauging relative amounts of fruit in baskets), while the left parietal region is involved in more precise numerical operations like addition and subtraction. What has not been known is whether the two hemispheres can work together to improve math performance. The new study demonstrates that they can. The findings were recently published online in Cerebral Cortex.

Tuning a piano also tunes the brain, say researchers who have seen structural changes within the brains of professional piano tuners.

Researchers at University College London and Newcastle University found listening to two notes played simultaneously makes the brain adapt. Brain scans revealed highly specific changes in the hippocampus, which governs memory and navigation. These correlated with the number of years tuners had been doing this job.

The Wellcome Trust researchers used magnetic resonance imaging to compare the brains of 19 professional piano tuners - who play two notes simultaneously to make them pitch-perfect - and 19 other people. What they saw was highly specific changes in both the grey matter - the nerve cells where information processing takes place - and the white matter - the nerve connections - within the brains of the piano tuners.

Investigator Sundeep Teki said: “We already know that musical training can correlate with structural changes, but our group of professionals offered a rare opportunity to examine the ability of the brain to adapt over time to a very specialised form of listening.”

Other researchers have noted similar hippocampal changes in taxi drivers as they build up detailed information needed to find their way around London’s labyrinth of streets. Prof Tim Griffiths, who led the latest study, published in Neuroscience, said: “There has been little work on the role of the hippocampus in auditory analysis. “Our study is consistent with a form of navigation in pitch space as opposed to the more accepted role in spatial navigation.”

Earphones ‘potentially as dangerous as noise from jet engines,’ according to new University of Leicester study: New research identifies for the first time how high volumes of sound damage nerve cell coating leading to temporary deafness.

University of Leicester researcher Dr Martine Hamann of the Department of Cell Physiology and Pharmacology, who led the study, said:

"The research allows us to understand the pathway from exposure to loud noises to hearing loss. Dissecting the cellular mechanisms underlying this condition is likely to bring a very significant healthcare benefit to a wide population. The work will help prevention as well as progression into finding appropriate cures for hearing loss.”

Pretend play can be fun for preschool children, but a new University of Virginia study, published in the current online edition of the journal Psychological Bulletin, finds that it is not as crucial to a child’s development as currently believed. Pretend play is any play a child engages in, alone, with playmates, or with adults, that involves uses of the imagination to create a fantasy world or situation, such as making toy cars go “vrrooooom” or making dolls talk.

Much of the previously presented “evidence” for the vitality of pretend play to development is derived from flawed methodology, according to Angeline Lillard, the new study’s lead author and a U.Va. professor of psychology in the College of Arts & Sciences. She said testers might have been biased by knowledge that they were testing children who had engaged in adult-directed pretend play prior to testing.

"We found no good evidence that pretend play contributes to creativity, intelligence or problem-solving," Lillard said. "However, we did find evidence that it just might be a factor contributing to language, storytelling, social development and self-regulation."

If you start exercising, your brain recognizes this as a moment of stress. As your heart pressure increases, the brain thinks you are either fighting the enemy or fleeing from it. To protect yourself and your brain from stress, you release a protein called BDNF (Brain-Derived Neurotrophic Factor). This BDNF has a protective and also reparative element to your memory neurons and acts as a reset switch. That’s why we often feel so at ease and like things are clear after exercising.

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Robots that can read and respond to brain waves will eventually help stroke patients regain movement, using new neural interfaces that can re-train damaged motor pathways. Neuroscientists have made great strides in brain-machine interfaces that can respond to a person’s thoughts — a new generation will drive a non-invasive robotic orthotic, retraining the patient’s own body.

Patients who have suffered a stroke or other injury can lose the active use of their limbs, rendering them unable to simply think about moving an arm or hand and then do it. Sometimes it’s possible to re-establish the lost connection, with time and repetitive physical therapy. Researchers at Rice University are using a robotic exoskeleton and a neural interface to improve matters.

Scientists at the University of South Florida (USF), the National Institutes of Health (NIH), Columbia University and the New York State Psychiatric Institute reported that the low-expression form of the gene monoamine oxidase A (MAOA) is associated with higher self-reported happiness in women. No such association was found in men.

The findings appear online in the journal Progress in Neuro-Psychopharmacology & Biological Psychiatry.

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