[asdf1234tx]

In the absence of historical data, receiving information from another person, without any quick way to verify what has been communicated, coupled with a necessity to decide/act, has long required/used a shortcut.

You look in that person's face, you make the call. You'all remember that stuff. Maybe not so common now, but it's still on TV.. "My word is my bond." and all that.

If that utterance doesn't come with a hardcore look of sincerity playing across the face, well then it's not believable. Looking emotional doesn't mean looking distraught. It means not looking like a mannequin.

Even with data, logic, reason, and an armful of facts, imagine two people with equal amounts of the aforementioned, trying to convince a 3rd party, but one of the individuals throws in expressions/mannerisms that communicate "trust", "sincerity", and "competence"...