For years, neuroscientists have struggled to understand how the microcircuitry of the brain makes learning easier for the young, and more difficult for the old. New findings published in the journal Nature by Carnegie Mellon University, the University of California, Los Angeles and the University of California, Irvine show how one component of the brain's circuitry — inhibitory neurons — behave during critical periods of learning. The paper is available online as an Advance Online Publication (http://dx.doi.org/10.1038/nature12485).
The brain is made up of two types of cells — inhibitory and excitatory neurons. Networks of these two kinds of neurons are responsible for processing sensory information like images, sounds and smells, and for cognitive functioning. About 80 percent of neurons are excitatory. Traditional scientific tools only allowed scientists to study the excitatory neurons.
"We knew from previous studies that excitatory cells propagate information. We also knew that inhibitory neurons played a critical role in setting up heightened plasticity in the young, but ideas about what exactly those cells were doing were controversial. Since we couldn't study the cells, we could only hypothesize how they were behaving during critical learning periods," said Sandra J. Kuhlman, assistant professor of biological sciences at Carnegie Mellon and member of the joint Carnegie Mellon/University of Pittsburgh Center for the Neural Basis of Cognition.
The prevailing theory on inhibitory neurons was that, as they mature, they reach an increased level of activity that fosters optimal periods of learning. But as the brain ages into adulthood and the inhibitory neurons continue to mature, they become even stronger to the point where they impede learning.
Newly developed genetic and imaging technologies are now allowing researchers to visualize inhibitory neurons in the brain and record their activity in response to a variety of stimuli. As a postdoctoral student at UCLA in the laboratory of Associate Professor of Neurobiology Joshua T. Trachtenberg, Kuhlman and her colleagues used these new techniques to record the activity of inhibitory neurons during critical learning periods. They found that, during heightened periods of learning, the inhibitory neurons didn't fire more as had been expected. They fired much less frequently — up to half as often.
"When you're young you haven't experienced much, so your brain needs to be a sponge that soaks up all types of information. It seems that the brain turns off the inhibitory cells in order to allow this to happen," Kuhlman said. "As adults we've already learned a great number of things, so our brains don't necessarily need to soak up every piece of information. This doesn't mean that adults can't learn, it just means when they learn, their neurons need to behave differently."
In addition to Kuhlman and Trachtenberg, Nicholas D. Olivas, Taruna Ikrar and Xiangmin Xu of UC Irvine, and Elaine Tring of UCLA contributed to this study.
The study was funded by the National Eye Institute (EY016052), the National Institute of Neurological Disorders and Stroke (NS078434) and a NARSAD Young Investigator Grant.
With a solid foundation of research excellence in neuroscience, psychology and computational science, Carnegie Mellon is a world leader in brain and behavioral sciences. For more information of brain, mind and learning research at Carnegie Mellon, visit http://www.cmu.edu/brain.
About Carnegie Mellon University: Carnegie Mellon is a private, internationally ranked research university with programs in areas ranging from science, technology and business, to public policy, the humanities and the arts. More than 12,000 students in the university's seven schools and colleges benefit from a small student-to-faculty ratio and an education characterized by its focus on creating and implementing solutions for real problems, interdisciplinary collaboration and innovation. A global university, Carnegie Mellon has campuses in Pittsburgh, Pa., California's Silicon Valley and Qatar, and programs in Africa, Asia, Australia, Europe and Mexico. The university recently completed "Inspire Innovation: The Campaign for Carnegie Mellon University," exceeding its $1 billion goal to build its endowment, support faculty, students and innovative research, and enhance the physical campus with equipment and facility improvements. The campaign closed June 30, 2013.
Warming ponds could accelerate climate change
21.02.2017 | University of Exeter
An alternative to opioids? Compound from marine snail is potent pain reliever
21.02.2017 | University of Utah
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
21.02.2017 | Earth Sciences
21.02.2017 | Medical Engineering
21.02.2017 | Trade Fair News