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This is Scientific American 60-Second Mind, I'm Christie Nicholson. Got a minute?

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Pheromones: they're those chemical signals often associated with attraction.

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But there are many chemical signals we give off--including ones that might signal alarm, aggression or other emotions.

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For example, take fear.

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If sweat contains compounds associated with fear, could someone smelling the sweat of a frightened person themselves wind up experiencing fear?

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To find out, researchers had male subjects watch two movies.

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One was scary, and the other made viewers feel disgusted.

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The researchers then collected the participants' sweat.

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Female subjects then smelled the sweat, while the scientists recorded their facial expressions.

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And the women who smelled "fear sweat" actually produced fearful facial expressions.

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While those who smelled the "disgust sweat" made disgusted faces.

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The inference is that the chemical compounds impelled the female subjects to remotely experience the same emotions felt by the sweaty males.

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The study is in the journal Psychological Science.

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Despite our lack of conscious awareness of interpersonal chemical communication,

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it seems that we nevertheless do physically and psychologically process such chemical signals.

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The researchers note that this study provides evidence that communication is not limited to language and visual cues alone:

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even we rational humans can become "emotionally synchronized" via scent.

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Thanks for the minute, for Scientific American 60-Second Mind. I'm Christie Nicholson.

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