Hidden Self is a nonverbal projective personality test based on the Szondi Test, a tool developed by the Hungarian psychiatrist Leopold Szondi in the 20th century.

The aim of the test is to reveal the deepest repressed impulses of a person on the basis of sympathy or aversion caused by the specific photos of psychopaths. Each photo is supposed to be a stimulus apt to detect the psychological drive tendencies of the examinee, from which the main personality traits can surface.

The test is based on the general notion that the characteristics that bother us in others are those that caused aversion to ourselves at an early stage of our life and that’s why we repress them. The results of test are not permanent, they will be different if your psycho-physical state is changes.

Also Szondi's research and career test showed that profession choices are determined by the dynamic and structure of the psyche.