Abstract
We tested how the introduction and removal of well-defined roles influenced contribution behaviors in instant messaging conversations. Pairs of participants worked on a referential communication task where one participant (the director) had more information than the other (the matcher). Next, these roles were removed and the participants were allowed to communicate freely. Participants then switched director/matcher roles and the procedure was repeated. On average participants in the director role wrote more than participants in the matcher role during the task. But instead of a balanced conversation during unstructured chat, which might have happened without a task preceding it, during off-task conversation former-matchers, on average, contributed more than former-directors. Results support the hypothesis that speech complementarity leads to efforts to redress imbalance, a process we call reciprocity.