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A psychological gesture. To be honest, this is not always the case, if a person scratches his head, then he is trying to remember something.
It is also a gesture of doubt, uncertainty, and distraction. This is an opportunity to give yourself time to think.
When a person remembers something, they focus all their attention on the thought process. He can even look up or close his eyes. And when all attention is focused on the upper body, then any stimuli in the form of an itchy head should be eliminated, so as not to distract from the mental process. Also, when you think, a large flow of blood with oxygen goes to the head, thus creating discomfort. While writing this, I scratched my head 20 times))