Laughter is regularly promoted as a source of health and well being, but it has been hard to pin down exactly why laughing until it hurts feels so good.RSS Feed Get Science News From The New York Times »The answer, reports Robin Dunbar, an evolutionary psychologist at Oxford, is not the intellectual pleasure of cerebral humor, but the physical act of laughing. The simple muscular exertions involved in producing the familiar ha, ha, ha, he said, trigger an increase in endorphins, the brain chemicals known for their feel-good effect.
A gene responsible for chronic pain has been identified, with scientists saying this could lead to drugs for treating long-lasting back pain.Writing in the journal Science, University of Cambridge researchers removed the HCN2 gene from pain-sensitive nerves in mice.Deleting the gene stopped any chronic pain but did not affect acute pain.
Each taste, from sweet to salty, is sensed by a unique set of neurons in the brains of mice, new research reveals. The findings demonstrate that neurons that respond to specific tastes are arranged discretely in what the scientists call a “gustotopic map.” This is the first map that shows how taste is represented in the mammalian brain.
There’s no mistaking the sweetness of a ripe peach for the saltiness of a potato chip – in part due to highly specialized, selectively-tuned cells in the tongue that detect each unique taste. Now, Howard Hughes Medical Institute and NIH scientists have added to our understanding of how we perceive taste, showing that four of our basic tastes—sweet, bitter, salty, and “umami,” or savory—are also processed by distinct areas of the brain. The researchers published their work in the September 2, 2011, issue of the journal Science.
Like explorers mapping a new planet, scientists probing the brain need every type of landmark they can get. Each mountain, river or forest helps scientists find their way through the intricacies of the human brain.
Researchers at Washington University School of Medicine in St. Louis have developed a new technique that provides rapid access to brain landmarks formerly only available at autopsy. Better brain maps will result, speeding efforts to understand how the healthy brain works and potentially aiding in future diagnosis and treatment of brain disorders, the researchers report in The Journal of Neuroscience Aug. 10
Scientists have found a way to use MRI scanning data to map myelin, a white sheath that covers some brain cell branches. Such maps, previously only available via dissection, help scientists detemine precisely where they are at in the brain. Red and yellow indicate regions with high myelin levels; blue, purple and black areas have low myelin levels.
Engineers from the Beckman Institute at the University of Illinois recently reported in the Proceedings of the National Academy of Sciences using small changes in the optical properties of single living cells to measure their growth.
“Determining the growth patterns of single cells,” the researchers write, “offers answers to some of the most elusive questions in contemporary cell biology: how cell growth is regulated and how cell size distributions are maintained.”
Multiple lifestyle factors such as obesity and alcohol consumption increase a person’s risk of diabetes. But new research suggests that a person’s odds of developing the disease may decrease for each positive lifestyle change they make. Prevent the struggles of alcohol abuse and seek the guidance of alcohol rehab if necessary.
Lifestyle factors that can influence the risk of developing type 2 diabetes include diet, weight, physical activity, smoking, and alcohol use.
Researchers, who surveyed about 200,000 people, say diabetes risk can be reduced by 31% for men and 39% for women for each positive lifestyle change, such as quitting smoking or regularly exercising. Also, alcohol use should not exceed one drink daily for women and two drinks daily for men.
Researchers at the University of Leeds have discovered a pain-free way of tackling dental decay that reverses the damage of acid attack and re-builds teeth as new.
The pioneering treatment promises to transform the approach to filling teeth forever.
Tooth decay begins when acid produced by bacteria in plaque dissolves the mineral in the teeth, causing microscopic holes or ‘pores’ to form. As the decay process progresses these micro-pores increase in size and number. Eventually the damaged tooth may have to be drilled and filled to prevent toothache, or even removed.
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