If you wish to enhance your effectiveness as a persuasive speaker — at home, at work, even with friends — attempt to become more expressive in your u… - Joe Navarro

When we press our lips together, it is as if the limbic brain is telling us to shut down and not allow anything into our bodies, because at this moment we are consumed with serious issues. Lip compression is very indicative of true negative sentiment that manifests quite vividly in real time.

When confronted with mixed signals from the face (such as happiness cues along with anxiety signals or pleasure behaviors seen alongside displeasure displays), or if the nonverbal facial messages are not in agreement, always side with the negative emotion as the more honest of the two. The negative sentiment will almost always be the more accurate and genuine of the person's feelings and emotions.

I have come to realize that there are two principal things we should look for and focus on: comfort and discomfort. [...] Learning to read comfort and discomfort cues (behaviors) in others accurately will help you decipher what their bodies and minds are truly saying.