Psychological Phenomenon in Group Discussions

Jane is part of a group project in her social psychology class where members must work collaboratively to present findings on group behavior theories. During the initial discussions, she notices that her quieter team members hold back their ideas, while the more vocal members dominate the conversation. This phenomenon reflects a broader concept within social psychology related to how individuals behave differently in groups compared to when they are alone. Which of the following best describes the primary psychological phenomenon Jane is witnessing in her group?