New research that studied thousands of twins who suffered a concussion early in life has grim implications on cognitive decline.
, followed thousands of twins who were World War II veterans, many of them identical. Since identical twins share genetic codecomparing the development of one twin who suffered a concussion to another who didn't provides the closest medical "what if?" scenario that science can get.
This decades-long effort, which started in the 1990s, found that twins who had a traumatic brain injury scored lower on cognitive tests than their counterparts at age 70. Furthermore, the speed of cognitive decline seems to be worsened by having multiple concussions, having a concussion after age 24, or having a concussion that resulted in loss of consciousness .
Also worthy of note is that these injuries were self-reported. As such, the possibility of erroneously recalled injuries can't be ruled out.The Washington Post
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