November 29, 2013 |
Researchers have lifted the veil on the brain cells that could explain why so many people remember where they were when John F. Kennedy was assassinated in Dallas 50 years ago. Cells in the brain “geotag” experience, helping us recall events through a spatial context, according to a study published Friday in the journal Science. The findings offer neurological confirmation of how humans retrieve a past experience -- by restoring a context indexed on a cellular level. Populations of specialized neurons that fired during the initial experience of a place fired in the same way when a subject consciously tried to recall events that occurred there, the study found.
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.
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.
February 6, 2014 |
A generic blood pressure drug could prevent hyperactive brain cell firing associated with early stages of autism spectrum disorder, according to a new study. Injecting pregnant mice with Bumetanide, a diuretic, appears to correct a developmental switch flipped during childbirth that reverses the firing characteristics of neurons in newborns, according to a study published online Thursday in the journal Science. Bumetanide mimics the effects of oxytocin, a hormone released during labor that helps protect newborns from the stresses and complications of birth, the study found.
April 26, 2013 |
Nicholas Spitzer and Davide Dulcis felt for people in higher latitudes whose attitudes soured in the shorter daylight hours of winter. The neuroscientists, who work in balmy San Diego, wondered whether summer was a bummer for rats. They're nocturnal, after all. That thought experiment has led the researchers to discover that an adult mammal's brain can “rewire” itself in response to light by recruiting brain cells to change the signaling chemical they ordinarily produce. Their research, published Thursday in the journal Science, offers hints toward new avenues of research into Parkinson's disease, stroke, addiction and depression.
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.