Several indicators are known as Manipulators, Adaptors or Pacifiers (MAPS). These are unknown signals displayed by someone to show anxiety or stress.
Touching a body part, focussed mainly above the shoulder line is a classic sign of MAPs. If you see this in a public speaker or a leader figure then it could be that the anxiety is deception related. Top or back of the head is a sign of anxiety. But the face, neck or side of head is touched it’s also anxiety but also deception too.
Picture to the left shows someone rubbing behind their ears, which is a classic MAP signal.
Another example of this is when someone scratches the cleft area between the lip and the nose. This is a sign of disbelief in something that has just been said.
If these manipulators come up during a conversation then be wary as it’s usually a sign of deception. But be careful, the gesture must be in context so for example if its a windy day and the hair blows and tickles the ear then use common sense.