Dialect Experiment

I would like to see if someone's dialect can be detected by how they look when they speak. If I could run the experiment, I would videotape people with different regional accents and remove the sound from the video. I would have the participants try to guess the region of the speaker by how they look when they talk and move their lips.

A variation to this could be to let the participants listen to the sound first and then try to match it to the video. The examples would have to be all the same gender and probably all the same race and age so the participants do not guess based on those characteristics. I'd be interested to see if people are accurate in this or not...