Researchers develop bionic body parts that work like the brain to sense texture, temperature, firmness, location of objects.
Category: neuroscience – Page 877
Micro implants could restore walking in spinal injury patients
People tend to think the brain does all the thinking, but the spinal cord has built-in intelligence, Mushahwar says. A complex chain of motor and sensory networks regulate everything from breathing to bowels, while the brain stem’s contribution is basically “go!” and “faster!” Your spinal cord isn’t just moving muscles, it’s giving you your natural gait.
Being able to control standing and walking would improve bone health, improve bowel and bladder function, and reduce pressure ulcers, the researchers say. For those with less severe spinal injuries, an implant could be therapeutic, removing the need for months of gruelling physical therapy regimes that have limited success, they add.
The team say they are now going to focus on refining the hardware further by miniaturising an implantable stimulator and getting approval from Health Canada and the FDA for human trials. The first generation of the implants will require a patient to control walking and movement through physical means, but longer term, the implants could potentially include a direct connection to the brain, they say.
New methods could help researchers watch neurons compute
Since the 1950s at least, researchers have speculated that the brain is a kind of computer in which neurons make up complex circuits that perform untold numbers of calculations every second. Decades later, neuroscientists know that these brain circuits exist, yet technical limitations have kept most details of their computations out of reach.
Now, neuroscientists reported December 12 in Cell, they may finally be able to reveal what circuits deep in the brain are up to, thanks in large part to a molecule that lights up brighter than ever before in response to subtle electrical changes that neurons use to perform their compuations.
Currently, one of the best ways to track neurons’ electrical activity is with molecules that light up in the presence of calcium ions, a proxy for a neuron spike, the moment when one neuron passes an electrical signal to another. But calcium flows too slowly to catch all the details of a neuron spike, and it doesn’t respond at all to the subtle electrical changes that lead up to a spike. (One alternative is to implant electrodes, but those implants ultimately damage neurons, and it isn’t practical to place electrodes in more than a handful of neurons at once in living animals.)
Experts review evidence yoga is good for the brain
Scientists have known for decades that aerobic exercise strengthens the brain and contributes to the growth of new neurons, but few studies have examined how yoga affects the brain. A review of the science finds evidence that yoga enhances many of the same brain structures and functions that benefit from aerobic exercise.
The review, published in the journal Brain Plasticity, focused on 11 studies of the relationship between yoga practice and brain health. Five of the studies engaged individuals with no background in yoga practice in one or more yoga sessions per week over a period of 10–24 weeks, comparing brain health at the beginning and end of the intervention. The other studies measured brain differences between individuals who regularly practice yoga and those who don’t.
Each of the studies used brain-imaging techniques such as MRI, functional MRI or single-photon emission computerized tomography. All involved Hatha yoga, which includes body movements, meditation and breathing exercises.
By turning stem cells into brain cells, Aspen Neuroscience hopes to rewind the progress of Parkinson’s disease
The idea of a cell therapy for Parkinson’s disease starts out simple: Symptoms of the progressive disease are largely driven by the deaths of dopamine-producing neurons found deep within the brain. With lower levels of the neurotransmitter come the characteristic tremors, rigidity and slow movements.
By replacing those lost nerve cells with new dopamine producers, researchers hope to renew the brain’s connection to the body’s muscles and improve a person’s overall motor function.
But in the brain, everything becomes more complicated. On top of the risk of immune system rejection that comes with any kind of living tissue transplant, it’s important to make sure the implanted cells function correctly and do not pick up any dangerous genetic mutations as they grow.
Dementia study reveals how proteins interact to stop brain signals
Fresh insights into damaging proteins that build up in the brains of people with Alzheimer’s disease could aid the quest for treatments.
A study in mice reveals how the two proteins work together to disrupt communication between brain cells.
Scientists observed how proteins—called amyloid beta and tau—team up to hamper key genes responsible for brain messaging. By changing how genes are expressed in the brain, the proteins can affect its normal function.