Activity of entire central nervous system captured on film for first time. The neural activity of an entire central nervous system has been captured in a fairly complex animal for the first time.
The video footage shows neurons firing in the nervous system of a fruit fly larva, Drosophila melanogaster, as it crawls back and forth. Scientists at the Howard Hughes Medical Institute in Ashburn, Virginia, imaged patterns of motor neuron activity in the organism as it crawled backwards and forwards. The images were captured five times per second for up to an hour, at a resolution high enough to see single neurons firing. The Machine That Tried To Scan The Brain — In 1882. Man with tiny brain shocks doctors - health - 20 July 2007. A man with an unusually tiny brain manages to live an entirely normal life despite his condition, which was caused by a fluid build-up in his skull.
Scans of the 44-year-old man's brain showed that a huge fluid-filled chamber called a ventricle took up most of the room in his skull, leaving little more than a thin sheet of actual brain tissue (see image, right). "It is hard for me [to say] exactly the percentage of reduction of the brain, since we did not use software to measure its volume. But visually, it is more than a 50% to 75% reduction," says Lionel Feuillet, a neurologist at the Mediterranean University in Marseille, France. Feuillet and his colleagues describe the case of this patient in The Lancet.
He is a married father of two children, and works as a civil servant. Not retarded. Reflecting on mirror neurons. Mirror neurons have been used to explain everything from language acquisition to autism.
Photograph: Alamy Chapter 11 of my book, 50 Human Brain Ideas You Really Need to Know. Here's the introduction to the book, and my post about the most important idea in neuroscience. Summary: Mirror neurons are cells that fire during both the execution and observation of a specific action. They have been linked to many behaviours and abilities, from empathy to learning by imitation, as well as implicated in conditions such as autism. Dying brains: is our last hurrah an explosion of conscious experience? What does it feel like to die?
Most of us have no idea, but around 1 in 10 people who survive a cardiac arrest report having near death experiences (NDEs). These can range from relived memories to vivid experiences of light, sound, and emotion. False memory planted in mouse's brain. Scientists have implanted a false memory in the brains of mice in an experiment that they hope will shed light on the well-documented phenomenon whereby people "remember" events or experiences that have never happened.
False memories are a major problem with witness statements in courts of law. Defendants have often been convicted of offences based on eyewitness testimony, only to have their convictions later overturned when DNA or some other corroborating evidence is brought to bear. In order to study how these false memories might form in the human brain, Susumu Tonegawa, a neuroscientist at the RIKEN-MIT Center for Neural Circuit Genetics, and his team encoded memories in the brains of mice by manipulating individual neurons. He described the results of the study in the latest edition of the journal Science. Memories of experiences we have had are made from several elements including records of objects, space and time. "Humans are very imaginative animals," said Tonegawa. Blind Woman Sees the Light Thanks to Bionic Eye. Neuroscience and Moral Responsibility. Often we think not.
For example, research now suggests that the brain’s frontal lobes, which are crucial for self-control, are not yet mature in adolescents. This finding has helped shape attitudes about whether young people are fully responsible for their actions. In 2005, when the Supreme Court ruled that the death penalty for juveniles was unconstitutional, its decision explicitly took into consideration that “parts of the brain involved in behavior control continue to mature through late adolescence.”
Charging toward better neural implants. Electrical implants that shut down excessive activity in brain cells hold great potential for treating epilepsy and chronic pain.
Likewise, devices that enhance neurons’ activity may help restore function to people with nerve damage. A new technology developed at MIT and Harvard Medical School may overcome the primary drawback to this approach, known as functional electrical stimulation: When electrical current is applied, it can spread to nearby nerves, causing painful side effects. Nerves, the long bundles of neuronal extensions that carry instructions to the muscles — as well as sensory information such as pain — communicate via extremely rapid electrical signals.
By manipulating the concentration of charged ions surrounding a nerve, the researchers were able to dramatically reduce the current needed to keep an impulse going; they could also interrupt an impulse as it traveled along a nerve. Treating damage with electricity. Scientists Create Tiny Artificial Brain That Exhibits 12 Seconds of Short Term Memory. Guiding lights. In a scientific first that could shed light on how signals travel in the brain and the effects of learning on neural pathways, scientists at Harvard have created genetically altered neurons that light up as they fire.
The work may also lead to speedier drug development. Led by John L. Loeb Associate Professor of the Natural Sciences Adam Cohen and described in Nature Methods on Nov. 27, the research involved using a gene from a Dead Sea microorganism to produce a protein that, when exposed to the electrical signal in a neuron, fluoresces, allowing scientists to trace the propagation of signals through the cell. “It’s very exciting,” Cohen said. Rebuilding the brain’s circuitry. Neuron transplants have repaired brain circuitry and substantially normalized function in mice with a brain disorder, an advance indicating that key areas of the mammalian brain are more reparable than was widely believed.
Collaborators from Harvard University, Massachusetts General Hospital (MGH), Beth Israel Deaconess Medical Center (BIDMC) and Harvard Medical School (HMS) transplanted normally functioning embryonic neurons at a carefully selected stage of their development into the hypothalamus of mice unable to respond to leptin, a hormone that regulates metabolism and controls body weight.
These mutant mice usually become morbidly obese, but the neuron transplants repaired defective brain circuits, enabling them to respond to leptin and thus experience substantially less weight gain. In 2005, Harvard Medical School Dean Jeffrey Flier, then the George C. The findings are to appear Nov. 25 in Science.