In the early "trucking" game studies by deutsch and krauss (1960, 1962), it was found that allowing the competing participants to communicate during the game

did not foster trust and cooperation.

Explanation:

Developing more favorable attitudes among participants in a dispute in cooperative situations fosters greater mutual trust and openness of communication, as well as providing a more stable basis for continued cooperation, despite the growth or undermining of certain objectives. This also encourages a perception of similarity of attitudes. However, communication does not bring the same benefits when participants are competitors. In this case, communication does not foster trust and cooperation.