Without sounding like internet hyperbole, this super-simple listening trick can help you better understand people's intentions. And provide a fascinating insight into the minds of others.
People like to talk. And when they talk, they often muddy the water about what they really mean because people tend to speak through an autobiographical lens, i.e., "this is my truth because it is from my perspective". Todd Davis, the Chief People Officer at Franklin Covey, has spent much of his career looking for the meaning in what people are saying, and has developed a way to better understand what people are really talking about. That technique is a small adaption to a basic skill that many people forget to do when they talk: listening, and then asking questions based on finding the truth in their perspective. Just doing that (Todd explains the practice in the video much better than I do here - Ed.) can make a world of difference in interpersonal interaction. Todd's latest book is Get Better: 15 Proven Practices to Build Effective Relationships at Work.
The average amount of eye contact adults make is 30-60% per conversation, 60-70% if they feel invested.
In many countries and regions of the world, take East Asia for instance, looking someone in the eye is considered rude. If that person is above you on the social hierarchy, say a professor, parent, or boss, doing so can be considered defiant. In the West however, maintaining eye contact is a sign of respect and earnestness. Avoiding eye contact is thought to be for a reason, such as you are lying, anxious, socially awkward, guilty, or untrustworthy. Sometimes it even telegraphs boredom with the topic of discussion.