Research shows that in leaderless groups, leaders emerge by quickly synchronizing their brain waves with followers through high quality conversations. Simply put, synchrony is a neural process where the frequency and scale of brain waves of people become in sync. Verbal communication plays a large role in synchronization, especially between leaders and followers. Synchrony between leaders and followers leads to mutual understanding, cooperation, coordinated execution of tasks, and collective creativity.
"The Science behind How Leaders Connect with Their Teams" is from hbr.org, published on March 31, 2016