Describing phalanx warfare, Thucydides wrote that “fear makes every man want to do his best to find protection for his unarmed side in the shield of the man next to him on the right.” The soldier farthest right must try to “keep his own unarmed side away from the enemy, and his fear spreads to the others who follow his example.” The effect of this fear, wrote the historian: “the right wing tends to get unduly extended.”

As a youth, the writer V.S. Naipaul struggled with hysteria. He described watching the film The African Queen while at Oxford: “Just when Bogart said something to Katharine Hepburn about sleeping one off or something, I could take it no longer and left the cinema. What form did it take? One was terrified of human beings. One didn’t wish to show oneself to them.” Naipaul claimed he cured himself over a two-year period. “Intellect and will,” he said, “intellect and will.”