When people communicate face to face they don't just exchange verbal information. Rather, communication encompasses the whole body. Communication partners synchronize their body sway, and mimic or imitate each other's body postures and actions. They produce a multitude of manual and facial gestures that help to illustrate what is being said, show how communication partners feel, or give away verbal cues. Moreover, face-to-face communication takes place in shared contexts where partners jointly attend and refer to the same objects, often while working on joint tasks such as carrying a table or...