The Face Gives Away Less Than You Hope

Faces leak real information. Almost none of it is the information people think they are reading.

Cicero said that the face is a picture of the mind, and two thousand years later it is still the first thing we read in a room. A micro expression is the involuntary version: a flicker that appears for a fraction of a second, driven by an emotion actually being felt. Held expressions are easy to fake. The flicker is much harder.
So the promise attached to this is tempting. Learn the signals and you can tell what somebody is thinking. Here is what the signals are, and here is what they are honestly worth.
Blinking
People who are uncomfortable blink more than people who are at ease. The claim usually attached to this is that a rise in blink rate exposes a lie. Discomfort is real and visible. What causes it is not written on the face.
The pupils
This one is genuinely outside anybody’s control. Look at something you find appealing and your pupils widen, whether or not you would like them to. It is as close to an honest signal as a face produces, and it reports interest rather than truthfulness.
The mouth and the exit
A hand drifting across the mouth. A swallow. A glance towards the door. These are collected as the tells of somebody managing a lie, and the reasoning is that a person who wants to be truthful and is not feels the tension of it.
Now the part that is usually left out
People are poor at detecting lies from behaviour. Charles Bond and Bella DePaulo gathered the research on this and published the result in 2006, pooling hundreds of studies in which people judged whether someone was telling the truth. Ordinary people and trained professionals alike landed only a little above a coin toss. Confidence rises with practice. Accuracy does not.
The reason is that every cue on the list above is a sign of stress, and being disbelieved is stressful whether or not you are lying. An honest person under suspicion produces the whole set.
So the superpower is real but pointed the other way. Faces are excellent at telling you that something is going on, and unreliable at telling you what. Treat a cluster of signals as a reason to ask a question, never as a verdict.
One more lens
Age changes what a face is even being asked to do. People who grew up with a screen between themselves and the conversation often say the hard things in writing and keep the face out of it. People who did not will want the difficult conversation in a room. Neither is avoidance. Knowing which one you are facing tells you where to hold the conversation.

















