The Bureau of Surrealist Research (Centrale Surréaliste) was the center for Surrealist writers and artists to meet, hold discussions, and conduct interviews. They investigated speech under trance.

The Bureau of Surrealist Research, also known as the Centrale Surréaliste or “Bureau of Surrealist Enquiries” was a Paris-based office in which a loosely affiliated group of Surrealist writers and artists gathered to meet, hold discussions, and conduct interviews in order to “gather all the information possible related to forms that might express the unconscious activity of the mind.”^[1] Located at 15 Rue de Grenelle, it opened on October 11, 1924 under the direction of Antonin Artaud, just four days before the publication of the first Surrealist Manifesto by André Breton.

https://en.wikipedia.org/wiki/Bureau_of_Surrealist_Research

https://www.press.uchicago.edu/Misc/Chicago/174115.html