Guys, has a woman ever left you tongue-tied by her mere presence? There may be a scientific reason. Researchers at Radboud University Nijmegen in the Netherlands performed the Stroop test -- a classic test of cognitive performance -- on men and women. The experimental groups were told that they were being observed by either male or female observers during the test. Men, when told that a woman was observing them, did poorly:

Once again, women’s performance on the test did not differ, regardless of whether they were expecting a man or woman to observe them. But men who had been told a woman would observe them ended up doing much worse on the second Stroop task. Thus, simply anticipating the opposite sex interaction was enough to interfere with men’s cognitive functioning.

Link | Photo: Flickr user Osamu Uchida