Unconscious communication is when someone sends out non-verbal signals that show how they are feeling without them noticing or even meaning to. Non-verbal signals can be things like facial expressions, body language, posture, and tone of voice. People can communicate a lot of things without even saying a word by displaying these non-verbal cues. Even though you might not be aware of it, you might be sending out unconscious messages that can tell someone else how you're feeling or what you're thinking.