In principle, just because a person is talking does not necessarily mean they are contributing, or that they are the only one contributing. Most of the time in a group decision setting, listening is the best contribution we can make. It is through listening, not talking, that we develop understanding, compassion, and creative solutions.
Practical Tip: Bite your tongue, cool your jets. To listen, do not talk. Do not be distracted by planning your talk. If I let you talk first while I listen, it gives me some practical advantages. First, to hear where you are coming from helps me choose my words. You have likely provided me some new information that I can incorporate. Second, once you have your words out you are more likely to be open to hearing mine. Third, not talking gives me time to listen within. I help the group's decision process when I consider my inner thoughts, how I really feel about something, so that when my words are spoken they are aligned with inner truth.