Ever the curious scientist, Pavlov spent months studying how the flood changed his dogs’ behavior. Many were never the same—they had completely different personalities after the flood, and learned behavior that was previously ingrained vanished. He summed up what happened, and how it applies to humans: Different conditions productive of extreme excitation often lead to profound and prolonged loss of balance in nervous and psychic activity . . . neuroses and psychoses may develop as a result of extreme danger to oneself or to near friends, or even the spectacle of some frightful event not
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