Brain

According to a new study from the University of Rochester, playing action video games sharpens vision. In tests of visual acuity that assess the ability to see objects accurately in a cluttered space, game players scored higher than their non-playing peers.

Neurobiologists have discovered a mechanism by which the constantly changing brain retains memories—from that dog bite to that first kiss. They have found that the brain co-opts the same machinery by which cells stably alter their genes to specialize during embryonic development.

Courtney Miller and David Sweatt reported their findings in the March 15, 2007 issue of the journal Neuron, published by Cell Press.

Using advanced brain imaging techniques, researchers at Georgetown University Medical Center have watched how humans use both lower and higher brain processes to learn novel tasks, an advance they say may help speed up the teaching of new skills as well as offer strategies to retrain people with perceptual deficits due to autism.

Employers would be better at keeping workers if they focused on why their employees want to stay rather than what kinds of things make them quit, according to researchers from the University of Washington and Truman State University.

Until recently, most research focused on why people leave jobs rather than why they choose to stay. In a review of the past 15 years of research on employee job satisfaction and voluntary turnover, the researchers examined not only why people quit but what makes workers stay in their current positions.

A team from Centre de recherche Université Laval Robert-Giffard (CRULRG) has made significant progress toward finding a way to determine whether a child is likely to one day suffer from bipolar disorder or schizophrenia. The findings of the research team supervised by Dr. Michel Maziade, director of CRULRG, professor in Université Laval’s Faculty of Medicine, and Canada Research Chair in the Genetics of Neuropsychiatric Disorders, will be presented at the International Congress on Schizophrenia Research on March 31 in Colorado Springs.

In order to differentiate and specialize, stem cells require very specific environmental cues in a very specific order, and scientists have so far been unable to prod them to go through each of the necessary steps. But now, for the first time, a study in mice by Rockefeller University scientists shows that embryonic stem cells implanted in the brain appear to develop into fully differentiated granule neurons, the most plentiful neuron in the cerebellum. The findings were reported Feb.

Researchers at the University of Illinois have found that adolescence is a time of remodeling in the prefrontal cortex, a brain structure dedicated to higher functions such as planning and social behaviors.

Unlike most of our sensory systems that detect only one type of stimuli, our sense of smell works double duty, detecting both chemical and mechanical stimuli to improve how we smell, according to University of Pennsylvania School of Medicine researchers in the March issue of Nature Neuroscience.

The origins of modern humans continues to be one of the most hotly debated topics among anthropologists, and there is little consensus about where and when the first members of our species, Homo sapiens, became fully modern. While fossil evidence tells a complex tale of mosaic change during the African Stone Age, almost nothing is known about changes in human 'life history,' or the timing of development, reproductive scheduling, and lifespan.

With an innovative combination of a novel application of synchrotron imaging, high-resolution microtomography, and developmental analysis, the team reconstructed tooth growth and determined the age at death of a fossil juvenile from Jebel Irhoud, Morocco. This study represents the first non-destructive approach to characterize dental development with a high degree of precision, as synchrotron images reveal microscopic internal growth lines without damage to the specimen.