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original news source
People all over the world respond similarly to a fearful expression, even a photograph of one. In this case, the face appeared and disappeared so quickly the volunteers could have had no conscious awareness of it.
"Psychologists have suggested that people with anxiety disorders are very sensitive to subliminal threats and are picking up stimuli the rest of us do not perceive," said Joy Hirsch, who worked on the study.
"Our findings now demonstrate a biological basis for that unconscious emotional vigilance."