Sigmund Freud developed the technique for treating emotional problems through exploration of the subconscious, this technique is known as psychoanalysis.
Sigmund Freud (1856 to 1939) was the founding father of psychoanalysis, a method for treating mental illness and also a theory which explains human behavior.
"Psychoanalysis is a method for the diagnosis and treatment of various psychological problems. This type of analysis focuses on the unconscious mind."
Psychoanalysis is a type of therapy that aims to release pent-up or repressed emotions and memories in or to lead the client to catharsis, or healing.
Hence the answer is Sigmund Freud.
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