 He is credited as the first forensic psychologist by Guinness World Records.Schrenck-Notzing investigated the medium Eva Carrière and believed the ectoplasm she produced was genuine.However, Schrenck-Notzing did not believe her ectoplasm "materializations" were anything to do with spirits, he claimed they were the result of "ideoplasty" in which the medium could form images onto ectoplasm from her mind.