Think of a time when you glimpsed a television programme in a language you didn't understand. I bet that you quickly formed views about the personalities you saw and heard on screen – whether you liked them, would believe them or trust them.
You couldn't have made those judgments based on what the personalities were actually saying. Rather, your view must have been driven by how they looked and how they sounded.
When conversing with people, we make judgments about them constantly. Of course they're doing the same with us – probably more so when we're answering their questions than at any other time.
You have to conclude that a big part of these judgments is due to what's interpreted from voices, facial ...