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The Romans developed a special sling round that not only physically harmed their opponents, but also mentally scared those who heard it. They drilled small holes in the stones they put in their slings so that the stones would whistle as they flew through the air until they hit their target. This is one of the earliest forms of psychological warfare.
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The Aztec developed a whistle specially designed to strike fear in the hearts of their opponents. The whistle was made to sound like a human howling in pain. The Aztec would have 1,000 men blow their whistles before charging into battle.
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Genghis Khan was a terrifying genius. He used fear and terror tactics when invading cities and tribes. During the siege of Merv, each Mongol soldier was ordered to decapitate 400 inhabitants before burning the city to the ground.
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Timur the Lame was a 14th-century Uzbek chieftain who beheaded all of his opponents and built pyramids with their skulls. This earned him a fearsome reputation, as he killed 5% of the worlds population at the time, beheading all of them.
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Vlad impaled all of his prisoners of war on wooden spikes just outside the walls of his cities as a deterrent for invaders.
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Psychology is a self-conscious field of experimental study began in 1879.
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The worlds first psychology lab was built by a German Physiologist named Wilhelm Wundt at the University of Leipzig.
