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The participants’ estimates of the men’s aggression correlated with the men’s actual aggression as revealed in the lab task. Carre’s team think the participants were using the width-to-height ratio of the men’s faces as a cue to their aggression. The wider a man’s face relative to its length, the more aggressive the participants tended to think he was. In turn, and consistent with prior research, the width-to-height ratio of the men’s faces correlated with their levels of aggression.
A second study with 16 female participants replicated these findings even though the men’s faces were presented for just 37 milliseconds each – barely long enough to be consciously detected.
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