More men than women develop Parkinson’s disease and new work presented at the Federation of European Neuroscience Societies says that it is do to sex differences in how brain cells change. Parkinson’s disease affects about 9 million people and becomes increasingly prevalent with age.
Diminishing a person's belief in free will leads to them feeling less like their true selves, according to recent research published in Social Psychological and Personality Science. In a pair of studies, researchers from Texas A&M University manipulated people's beliefs in free will to see how this would affect the subjects' sense of authenticity, their sense of self.
"Whether you agree that we have free will or that we are overpowered by social influence or other forms of determinism, the belief in free will has truly important consequences," says lead author Elizabeth Seto, a Graduate Student at the Department of Psychology at Texas A&M University.
An effective and less expensive tool for the inspection of food and drugs could soon be a reality. Scientists from the Fritz Haber Institute of the Max Planck Society in Berlin have been working with national and international partners to develop a conceptually new source of terahertz radiation. The innovation makes it much easier to generate this radiation, which is well suited to the analysis of soft materials and could therefore be more widely used in the food and pharmaceutical industry in future.
A new paper in the Journal of Evolutionary Biology reviewed all mammal species known from the end of the Cretaceous period in North America and found that over 93 percent became extinct across the Cretaceous-Paleogene (K-Pg) boundary, due to the same asteroid that killed the dinosaurs in the Cretaceous period 66 million years ago.
That's significantly more than previously thought - but mammals also recovered far more quickly than previously though.
Celiac disease is a rare immune-based condition brought on by the consumption of gluten in genetically susceptible patients. In recent years a larger number of people have stated they are gluten sensitive or even celiac despite lack of a diagnosis, and many dismissed that as the nocebo effect - people who give up something harmless and feel better, the opposite of people who take something harmless and feel better, a placebo. They argued that people who were embracing it because of pop culture books on wheat.
In the 1950s, thalidomide (Contergan) was prescribed as a sedative drug to pregnant women, resulting in a great number of infants with serious malformations. Up to now, the reasons for these disastrous birth defects have remained unclear. Researchers at the Technical University of Munich (TUM) have at last identified the molecular mechanism of thalidomide. Their findings are highly relevant to current cancer therapies, as related substances are essential components of modern cancer treatment regimens.
Women who commit deadly violence are different in many ways from male perpetrators, both in terms of the most common victims, the way in which the murder is committed, the place where it is carried out and the perpetrator's background. This is shown by a new study that also investigated homicide trends over time in Sweden.
Sweden is in the group of countries with the lowest number of murders per capita. As in other parts of the world, the majority of cases of deadly violence are committed by men: In nine cases out of ten, the perpetrator is a man.
It is also men that have been the main focus of studies in this area. We know less about the characteristics of women who commit deadly violence, because they have been the subject of far fewer studies.
Giant Ice Age species including elephant-sized sloths and powerful saber-toothed cats that once roamed the windswept plains of Patagonia, southern South America, were finally felled by a perfect storm of a rapidly warming climate and humans, according to a paper in Science Advances.
The timing and cause of rapid extinctions of the megafauna has remained a mystery for centuries.
The work led by the Australian Centre for Ancient DNA (ACAD) at the University of Adelaide, says that it was only when the climate warmed, long after humans first arrived in Patagonia, did the megafauna suddenly die off around 12,300 years ago, after the last Ice Age intermission.
The researchers asked test participants in different age cohorts to feel two needlepoints that were located closely to each other with the tips of their fingers. Older participants perceived two points as a single event even when they were located quite far apart, whereas younger people were still able to distinguish them as two distinct points, which is evidence for degraded tactile perception at higher age. This impaired perception experienced by older people goes hand in hand with a spatial enhancement of brain activity, which researchers generally interpret as a compensatory mechanism.
Learning and training improve perception
Professional footballers and their coaches often complain about the mental fatigue induced by the stress of frequent matches.
Now research from the University of Kent has demonstrated for the first time that mental fatigue can have a negative impact on football performance by reducing running, passing, and shooting ability.
Professor Samuele Marcora of Kent's School of Sport and Exercise Sciences worked with researchers from the University of Technology, Sydney, Australia, and Ghent University in Belgium on the study published in the journal Medicine & Science in Sport & Exercise.
Cholera outbreaks are on the rise. To prevent and control them, three oral cholera vaccines are currently approved by WHO. A study published in PLOS NTDs examining the immune response to one of them in Haitian adults finds that while the first vaccine round elicits a strong cholera-specific response in the mucosa (the first point of contact with the cholera pathogen), the booster dose after 2 weeks does not appear to stimulate the immune system further.
Cerebellar ataxia is a condition of the cerebellum that causes an inability to coordinate muscle movements. A study publishing June 16 in Cell Reports now describes a new genetic mutation as an additional cause of ataxia in humans and mice. The mutation, in the gene CAPN1, affects the function of the enzyme calpain-1 and causes abnormal brain development. The same genetic mutation is also associated with ataxia in Parson Russell Terrier dogs.
Vocal cords are able to produce a wide range of sound frequencies because of the larynx's ability to stretch vocal cords and the cords' molecular composition - according to a new paper published in PLOS Computational Biology. Scientists, led by Ingo Titze at the University of Utah, show how these two characteristics of various species' larynxes can closely predict the range of frequencies each species can produce. The results reveal the evolutionary roots of how and why voice arose.
