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

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.

When we speak, we naturally utilize various parts of our body — such as the eyebrows, head, hands, arms, torso, legs, and feet — to emphasize a point about which we feel deeply or emotionally. Observing emphasis is important because emphasis is universal when people are being genuine.

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.