The terms introvert and extrovert were first socialized in the 1920s by psychologist Carl Jung.

Scientists don’t know for sure the causes of introversion or extroversion. However, researchers have found that introverts have a higher blood flow to their frontal lobe; this is the part of the brain that helps with memory, problem-solving, and planning.

They like to think in silence. When you see the quiet people in the room, be aware that the silence is just an illusion: there’s nothing quiet inside, but hundreds of voices and competing ideas. There’s no peace, no rest.

An introvert’s job is to break through the clutter, eliminate the noise and listen to one voice and one only. It’s an exhausting and meticulous task.