Interesting read I thought 
"By Julie Steenhuysen
CHICAGO (Reuters) - Smiles may take a while, but a horrified expression is a sure-fire attention getter, U.S. researchers said on Sunday, based on a study of how fast people process facial expressions.
They believe fearful facial expressions make a beeline to the alarm center of the brain known as the amygdala, cuing humans to potential threats."
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"By Julie Steenhuysen
CHICAGO (Reuters) - Smiles may take a while, but a horrified expression is a sure-fire attention getter, U.S. researchers said on Sunday, based on a study of how fast people process facial expressions.
They believe fearful facial expressions make a beeline to the alarm center of the brain known as the amygdala, cuing humans to potential threats."
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