Someone whose main function in a group discussion is to contribute and debate ideas is called a ?

Someone whose main function in a group discussion is to contribute and debate ideas is called a gate keeper.

two essential roles in group discussion are gate  keeping and time keeping.

gate  keeping is a form  of verbal traffic management. a gate keeper  attempts to spread participation by encouraging those who have not recently spoken to share their thoughts and questions.

gate  keeping is also necessary when several people wish to speak at once. at such times, encouraging the less assertive members to continue first will often facilitate communication. gate  keeping also the group move efficiently from one topic to the next and through the steps of the discussion outline.