I just wrote the word “chatter”, but then, googling it, I found no definition in the direction of “one who participates in a computer based chat”. Can the role of such a person be called a “chatter”? If not, then what?
With a Turing test anything that would place the computer at even more of a disadvantage than it already is, is strictly forbidden. Hence the text only chat communication with the skeptics/critics/judges (whatever). One doesn’t want an observant skeptic noting, say, that one chatter is metallic with a lot of electric wires, while the other one looks and sounds very much like a human female, has a glass of water at her side, and even wears a nice perfume.