http://media.caltech.edu/press_releases/12457
"The findings show that human preferences may be more fundamentally tied to "feedback" between the very act of gazing and the internal, cognitive prototype of attractiveness than was formerly assumed. Earlier work by other researchers has relied on the "attractiveness template," which assumes that an individual's ideal conception of beauty has somehow been imprinted on his or her brain due to early exposures to other people's faces, such as the mother."
"The second experiment is "gaze manipulation," in which the faces are not shown simultaneously, but in sequences of varying duration on the two sides of the computer screen. In other words, one face was shown for a longer time (900 milliseconds) than the other face (300 milliseconds), and as a control, the faces were also shown to other subjects in the center of the screen in an alternating sequence."
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