Much to the scientists' surprise, the men, after seeing an emotional face for just one fifth of a second--so briefly that it was still unconscious--were more emotionally reactive than the women. But it's what happened to the men's facial muscles next that helped me explain Neil's guy face to Danielle. As the experiment proceeded, at 2.5 seconds, well into the range of conscious processing, the men's facial muscles became less emotionally responsive than the women's. The researchers concluded that the men consciously--or at least semiconsciously--suppressed showing their emotions on their faces. Meanwhile, the women's facial muscles became more emotionally responsive after 2.5 seconds. According to the researchers, this suggests that men have trained themselves, perhaps since childhood, to automatically turn off or disguise facial emotions. The females' expressions not only continued to mirror the emotion they were seeing on the face in the photo, but they automatically exaggerated it, from a grin to a big smile or from a subtle frown to a pout. They, too, had been practicing this since childhood.