September 26, 2013 |
Cocaine messes around with the brain. That scientific no-brainer has been getting more focused over the years, as neuroscientists identify key circuitry that can be reshaped by addiction. But an addiction researcher in Switzerland believes his colleagues may have been a bit too focused on the accelerator instead of the brakes - stimulation rather than disinhibition. Cocaine interferes with a natural inhibitor holding a reward neurotransmitter in balance, and without that brake, an unrestrained flow of dopamine sets off circuitry changes that have been tied to addictive behavior, according to a study published online Thursday in the journal Science.
June 1, 2013 |
As the brain fitness craze grows, so do the number of software programs that promise to boost mental skills. Here, we take a look at three of the largest companies in the digital brain health industry. Each offers trial games that users can play free: -- Lumosity With more than 35,000 registered users -- and more than 600 million game plays -- Lumosity has a strong presence in the brain-training circuit. Users' cognitive abilities are rated on a Brain Performance Index, or BPI, based on scores from tasks designed to test memory, attention, speed, flexibility and problem-solving skills.
June 6, 2013 |
If you lived during the early Cold War, you got nuked. On the other hand, you may have grown new brain cells. That's the take-away of research in the journal Cell that calculated the growth of brain cells in adult brains by using an isotope of carbon that was picked up by humans from the fallout due to above-ground nuclear testing from the late 1940s to 1963. Neuroscientists have shifted from an old view that you'll never have more neurons than you had when your brain was a pup. Studies have suggested that adult brains generate new neurons, particularly in the hippocampus, an area crucial to learning and memory.
November 20, 2013 |
The eyes may be the mirror of the soul, but for those with autism, the mouth will have to do. Researchers at Cedars-Sinai Medical Center isolated neurons in the brain's amygdala that respond to facial expressions, and tested patients with autism against those without. Both groups could correctly identify a "happy" or "fearful" face, a function long associated with the amygdala. But when the researchers examined which neurons fired in relation to areas of the face, they found that those with autism "read" the information from the mouth area more than from the eyes and seemed to be lacking a population of nerve cells that respond only to images of eyes.
June 10, 2008
Fat cells: A June 2 Health section article on fat cells said that brain cells are never replaced. Although the body doesn't create new cells in the brain's cortex and cerebellum, it does continue to create cells, or neurons, in other parts of the brain.
October 23, 2012 |
Here's something for raw-food aficionados to chew on: Cooked food might be a big reason humans were able to grow such large brains compared to their body size, scientists say. If modern human ancestors had eaten only raw food, they'd have to regularly feed more than nine hours a day, according to a study published online Monday in Proceedings of the National Academy of Sciences. A pair of researchers from the Instituto Nacional de Neurociéncia Translacional in São Paulo, Brazil, decided to try and help explain why modern humans' brains were able to grow so large compared to their body size and why other primates' brains did not. They looked at the relative brain-to-neuron-counts of a host of primates, from owl monkeys to baboons.