Charness and Dufwenberg (2006) find that promises increase cooperation and suggest that the behavior of subjects in … observed effects regarding the impact of communication are due to internal factors and not due to an outside bystander …

We examine experimentally the impact of communication on trust and cooperation. Our design admits observation of … avoid guilt, as can be modeled using psychological game theory. When players exhibit such guilt aversion, communication may …

We use experiments to analyze what type of communication is most effective in achieving cooperation in a simple … subjects can only use a limited message space that does not allow communication of contingent strategies. When unlimited pre …-game communication is allowed, a similar initial decline in collusion reverses over time. Content analysis is used to identify multiple …