Here is a crazy experiment that might reveal something interesting: a meeting where participants talk only via a speech synthesizer.  Obviously speech synthesize has to be really good and have to support multiple voices so participants can identify individuals by their 'synthesized voice'.

The point of the experiment is to measure the effects of separating a person's thoughts from his or her physical body.  While the effect should be most pronounced for the speaker, I think listeners will also be affected.  I am not sure what kind of effects this form of communication will have on individuals and the group, but it sure will be weird.

Anyway, this was just a dump (as in core dump).