Without them speaking a single word, you may be able to determine if someone is in a good mood, feeling sad or angry just by reading their face. Reading their face activates the same muscles in your face even when there is no deliberate recognition of the expression “mimicked.” Theamygdale (part of the limbic system) attaches emotional value to faces, enabling us to make immediate automatic evaluations of other’s trustworthiness/untrustworthiness. The amygdale is the part of the brain that makes it possible to read someone else’s face for clues to how they are feeling. (From: The Brain and the Mind (2011) by Max Harris, Ph.D.)