The abstract oversells it, as usual. The effects are small, and the modelling is loose. Other studies have shown that gestures can play a role in turn taking, and that we are capable of predicting when the speaker is going to finish simply by listening. Eye contact may be just one more factor weighing in.
Is there a book out there on coaching people who are bad at 'finishing'?
I have sympathy for people who have been institutionally censored and I feel properly guilty when we are interrupting them. But some people just go on and on, and/or telegraph false finishes, then try to invoke the same kind of courtesy when they are cut off.
