It's not just what we say, it's how we say it.

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Want to know how a Japanese person is feeling? Pay attention to the tone of his voice, not his face. That’s what other Japanese people would do, anyway. A new study examines how Dutch and Japanese people assess others’ emotions and finds that Dutch people pay attention to the facial expression more than Japanese people do.  “As humans are social animals, it’s important for humans to understand the emotional state of other people to maintain good relationships,” says Akihiro Tanaka of Waseda Institute for Advanced Study in Japan. “When a man is smiling, probably he is happy, and when he is crying, probably he’s sad.” Most of the research on understanding the emotional state of others has been done on facial expression; Tanaka and his colleagues in Japan and the Netherlands wanted to know how vocal tone and facial expressions work together to give you a sense of someone else’s emotion.