“…A key point is that social realities alter perceptual out looks. Because human perception is noto riously poor and people are prone to interpret ing information patterns that reflect their worldviews, the rapid spread of false beliefs in community settings is not typically precipi tated by mental disturbance, and rarely re sults in psychogenic symptoms [2,7], D ancing with M yth s Medieval dancing manias, which spread across Europe during the latter Middle Ages, arc almost universally portrayed as a histori cal and culture-specific variant of epidemic conversion symptoms precipitated by pent-up stress caused by the Black Death and other catastrophes [8], Researchers have failed to adequately assess the social, cultural, histori cal and political context of these highly com plex 'pandemics', which were not sponta neous outbursts, but highly organized forms of worship, and often involved large groups of both genders. Vigorous dancing in the vicinity of religious shrines was widely held to be a means of attaining divine penance and favor, and enjoyed an influx of participants during stressful periods.…”