It was found that the women who had less time between flights had smaller right temporal lobes. This area of the brain deals with recognizing and remembering what is seen. The same group performed worse and had slower reaction times on the visual memory test. And their saliva samples showed higher levels of stress hormones.
The researcher believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.
Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently (永久性的) affect memory.
67. According to the text, jet lag .
can cause difficulties in speaking
can make people feel tired for a few weeks
can be only found in flight attendants
can be caused by flying over several time zones
68. It can be inferred from the text that .
the conclusion is refused by many scientists
scientists fear that this research is not done properly
the scientific conclusion needs the support from many tests
every women who were examined in the research were mot healthy
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