How did Bergson come to be interested in psychical researches? : from a methodological perspective

Although rarely pointed out, Henri Bergson（1859-1941）was highly interested in psychical phenomena, or to be exact, in researches on such phenomena. But why? In this paper I am going to clarify the reason. Unfortunately there is no article in which Bergson directly mentions psychical researches except for ““Phantasms of the Living” and “Psychical Research””（1913）. So I start by examining this exceptional article, and after that I turn my eyes to several related articles. Finally I will conclude that Bergson, whose speculation is firmly based on modern sciences, regards psychical researches as the newest one.