You Are the Ultimate Lie Detector
Briefly

Even though we all want the same thing, to feel valued by someone else, not everyone can be trusted. Some people lie and are deceptive: Even when being treated with respect, they may strive to take advantage of you.
We have a brain chemical of trust called oxytocin (OT). Trusting someone is a part of being human. How other people interpret your face can increase their own OT levels, enhancing the relationship and connection between you.
And the way we are feeling can sometimes influence the way we interpret another person's face. Secure people see more opportunity for connection. Anxious people see more threats.
This unfortunate but real component of humanity has a biological and evolutionary origin. Millions of years ago, those who trusted faces that resembled their own had a survival advantage.
Read at Psychology Today
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