“
The significance of shared arousal was demonstrated in an ingenious experiment designed by researcher Joshua Conrad Jackson and published in the journal Scientific Reports in 2018. Jackson and his colleagues set out “to simulate conditions found in actual marching rituals”—which, they noted, “required the use of a larger venue than a traditional psychology laboratory.” They chose as the setting for their study a professional sports stadium, with a high-definition camera mounted twenty-five meters above the action. After gathering 172 participants in the stadium and dividing them into groups, the experimenters manipulated their experience of both synchrony and arousal: one group was directed to walk with their fellow members in rank formation, while a second group walked in a loose and uncoordinated fashion; a third group speed-walked around the stadium, boosting their physiological arousal, while a fourth group strolled at a leisurely pace. Jackson and his collaborators then had each group engage in the same set of activities, asking them to gather themselves into cliques, to disperse themselves as they wished across the stadium’s playing field, and finally to cooperate in a joint task (collecting five hundred metal washers scattered across the field). The result: when participants had synchronized with one another, and when they had experienced arousal together, they then behaved in a distinctive way—forming more inclusive groups, standing closer to one another, and working together more efficiently (observations made possible by analyzing footage recorded by the roof-mounted camera). The findings suggest that “behavioral synchrony and shared physiological arousal in small groups independently increase social cohesion and cooperation,” the researchers write; they help us understand “why synchrony and arousal often co-occur in rituals around the world.
”
”