But it is not clear what the results indicate:
"We have been unable to identify any clinical deficits in any of the U-2 pilots studied, and all of the U-2 pilots that were part of this study are still performing the extremely complex tasks associated with flying the U-2 plane," he noted. "What we do not know is the long-term implication of these findings, nor what the threshold might be for inciting clinical symptoms," Dr. McGuire added.