This exchange of turns or 'floors' is signaled by such linguistic means as intonation, pausing, and phrasing. Some people await a clear pause before beginning to speak, but others assume that 'winding down' is an invitation to someone else to take the floor. When speakers have different assumptions about how turn exchanges are signaled, they may inadvertently interrupt or feel interrupted. On the other hand, speakers also frequently take the floor even though they know the other speaker has not invited them to do so. Listenership too may be signaled in different ways.
Some people expect frequent nodding as well as listener feedback such as 'mhm', 'uhuh', and 'yeah'.
Frederick Erickson has shown that this can occur in conversations between black and white speakers, because of different habits with regard to showing listenership. Oh' prepares the hearer for a surprising or just-remembered item, and 'but' indicates that sentence to follow is in opposition to the one before. However, these markers don't necessarily mean what the dictionary says they mean. Some people use 'and' just to start a new thought, and some people put 'but' at the end of their sentences, as a way of trailing off gently. Realizing that these words can function as discourse markers is important to prevent the frustration that can be experienced if you expect every word to have its dictionary meaning every time it's used.