[jollyllama]

The wikipedia page isn't as detailed as I recall. I don't think that physiological disease can totally explain the phenomenon. The building of stages and congregating of dancers together, to me, suggests there was another dimension to the phenomenon.

[BigCryo]

Humans are highly social animals.. everything is seen is an opportunity for socializing come at least that's the way it was and more tightly bound societies such as we had before today's atomized modern society

[jollyllama]

Even if some were dancing for physiological reasons, it would be arbitrary to discount the people who join in for social reasons.