Humans Naturally Follow Crowd Behavior
online.wsj.com
online.wsj.com
"Sure In one study, a few ringers simply joined the crowd and stared up at a spot in the sky for 60 seconds. Then the researchers recorded and analyzed the movements of the people around them. The scientists found that within seconds hundreds of people coordinated their attention in a highly systematic way. People consistently stopped to look toward exactly the same spot as the ringers."
This hardly says 'Humans naturally follow crowd behavior". It more says humans investigate usual behavior. Of course if people start looking up around a person will wonder want is going on, as this is unusual. The same as you would look at a person doing anything unusual like dancing/stripping in a crowd etc. The difference with people all looking up is you have to mimic them to investigate their unusual behavior. I hardly think if these ringers started hoping on one foot that hundreds of people around them would to. The crowd would largely look at them, not follow them.
That isn't the right word... a better word is "confederate".