www.scientificamerican.com/ article/ zen-gamma/
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Clumps of harmful proteins that interfere with brain functions have been partially cleared in mice using nothing but light and sound. Research led by MIT has found strobe lights and a low pitched buzz can be used to recreate brain waves lost in the disease, which in turn remove plaque and improve cognitive function in mice engineered to display Alzheimer's-like behaviour. . . Several years ago, Tsai discovered light flickering at a frequency of about 40 flashes a second had similar benefits in mice engineered to build up amyloid in their brain's nerve cells. "The result was so mind-boggling and so robust, it took a while for the idea to sink in, but we knew we needed to work out a way of trying out the same thing in humans," Tsai told Helen Thomson at Nature at the time. . . One such set of oscillations are defined as gamma-frequencies, rippling across the brain at around 30 to 90 waves per second. These brain waves are most active when we're paying close attention, searching our memories in order to make sense of what's going on. Tsai's previous study had suggested these gamma waves are impeded in individuals with Alzheimer's, and might play a pivotal role in the pathology itself. Light was just one way to trick the parts of the brain into humming in the key of gamma. Sounds can also manage this in other areas.
Researchers at the University of Wisconsin-Madison have found that during meditation, Zen Buddhist monks show an extraordinary synchronization of brain waves known as gamma synchrony-a pattern increasingly associated with robust brain function and the synthesis of activity that we call the mind. Brain waves are produced by the extremely low voltages involved in transmitting messages among neurons. Most conscious activity produces beta waves at 13 to 30 hertz, or cycles per second. More intense gamma waves (30 to 60 or even 90 Hz) generally mark complex operations such as memory storage and sharp concentration.