In addition, 112 undergraduate observers were shown videos of the backsides of the volunteers as they walked at various speeds on the treadmill. The volunteers then walked on a treadmill for two minutes as a three-dimensional motion-capture system similar to those used by the movie industry to create animated figures from living models made measurements of their motions, allowing researchers to track the precise amount of shoulder swagger and hip sway in their gaits.īased on these measurements, the researchers determined that the gay subjects tended to have more gender-incongruent body types than their straight counterparts (hourglass figures for men, tubular bodies for women) and body motions (hip-swaying for men, shoulder-swaggering for women) than their straight counterparts. Johnson and colleagues at New York University and Texas A&M measured the hips, waists and shoulders of eight male and eight female volunteers, half of whom were gay and half straight. "Now we've found that casual observers can use gait and body shape to judge whether a stranger is gay or straight with a small but perceptible amount of accuracy." "We already know that men and women are built differently and walk differently from each other and that casual observers use this information as clues in making a range of social judgments," said lead author Kerri Johnson, UCLA assistant professor of communication studies.
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