Je pense que c'est ce sens-là que prend "acknowledgement" quand il s'agit de communication non-verbale.

voir ex

"The key to acknowledgement
A powerful driving force in all customers and sales people is the desire to make a difference. We want to see that our lives count and we need to feel that we matter to someone, that we are noticed and important. That’s why acknowledgement is important. To acknowledge someone is to say: I see you. You are significant. I understand you…I admire you. This is the case with all humans, and because all selling is ultimately Human to Human selling we need to pay attention to acknowledgement and use it everyday to help us sell more, in less time.
People ask: “Is it possible to over-acknowledge someone?” Not if the acknowledgement is genuine. The concern should not be the quantity of acknowledgement, rather the quality of the gesture—whether our sincerity is in the acknowledgement. To my knowledge, no one has ever left an organization or refused to buy a product because they were acknowledged or supported too much. Sadly it’s a different story on the flipside. Who hasn’t heard a story about a customer that leaves a vendor because they perceive that the salesperson or the company doesn’t care?
Acknowledgement is about more than singling out someone and showing them with praise or gifts. There are also implicit support behaviors, and these should be worked into your daily sales calls and routines for all interaction."
http://www.articlesnatch.com/Article/The-Key-To-Acknowledgem...