The process of electrostimulation can enable people in their 70s to perform like a 20-year-old, in memory tasks. Working memory starts to decline in our late 20s and early 30s, Reinhart explains, as certain areas of the brain gradually become disconnected and uncoordinated. During the study, they asked a group of people in their 20s and a group in their 60s and 70s to perform a series of memory tasks that required them to view an image, and then, after a brief pause, to identify whether a second image was slightly different from the original. As we age, our theta rhythms become less synchronized and the fabric of our memories starts to fray. In the study, 14 of the young-adult participants performed poorly on the memory tasks despite their age — so he called them back to stimulate their brains too.
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