Consider epilepsy. If an epileptic seizure is focused in a particular sweet spot in the temporal lobe, a person won’t have motor seizures, but instead something more subtle. The effect is something like a cognitive seizure, marked by changes of personality, hyperreligiosity (an obsession with religion and a feeling of religious certainty), hypergraphia (extensive writing on a subject, usually about religion), the false sense of an external presence, and, often, the hearing of voices that are attributed to a god.10 Some fraction of history’s prophets, martyrs, and leaders appear to have had
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