This test reflects the ideas of Hans Eysenck a pioneer in the field of personality research. Through research and statistical analysis he determined that personality is composed of three main elements: Extroversion, Neuroticism, and Psychoticism. Most current researchers agree on the significance of the first two traits, but there is less consensus on the third (so he may be wrong about it's central importance but it clearly plays some role in personality). Most people will score lower on Psychoticism. While Psychoticism implies more negative qualities than the other two traits (typically), a link has been found is several studies between higher creativity and higher scores on Psychoticism.

Prior to Eysenck's discovery of Psychoticism, he correlated his original two traits (introversion and neuroticism) with an ancient greek personality system known as the Galen types (Melancholic, Choleric, Sanguine, Phlegmatic).

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