On the other hand, no one can be right about everything. Psychologist Nicholas Rule of the University of Toronto and colleagues wanted to know what happens when initial information about a person conflicts with new discoveries that come out as they get to know each other.
To test the question, the researchers took advantage of real-life gaydar: On average, people are able, with about 65 percent accuracy, to tell from a person's face whether they are gay or straight.
The researchers asked participants to look at pictures of both gay and straight men. In half of cases, the photos were labeled with the person's correct sexual orientation. In the other half, the label was wrong, saying that a straight man was gay or vice versa.
Next, the participants had to take a computer quiz, correctly recalling whether each man was gay or straight, according to the labels. They saw each face come up on screen and had to answer correctly for every single photograph three times. If they made a single mistake, they had to start all over again.
"By the end, they really knew who was gay and who was straight," Rule told Live Science.
The twist, Rule said, was that the participants were given different amounts of time to see the faces in the quiz section. Some went through the pictures at their own pace; others had as little as a 20th of a second, the amount of time it takes people to judge sexual orientation from a face alone.
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