Collective hallucination has never been observed in thousands of people.
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« Hallucinations can be of various kinds (visual, auditory, tactile or psychic), but they always manifest a disturbance in a person's brain. They systematically occur in a context of personality imbalance or destructuring, and are generally accompanied by various behavioural disorders (agitation, fluctuating anxiety, inappropriate behaviour, etc.). This is why true "collective hallucinations" are a priori medically and logically impossible: they would presuppose that the same disturbances occur identically and simultaneously in different brains, in the absence of any objective external cause. »
Michel-Yves Bolloré, Olivier Bonnassies, God, science, evidence: the dawn of a revolution, p.483-484, Guy Trédaniel
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