In 1926, Rin Hirano and Tomita Yashima published the article "Blood Type Biological Related" in the Army Medical Journal. Hippocrates also sought to link personality biologically, linking traits with the four bodily humors – sanguine, phlegmatic, choleric, and melancholic. The idea that personality traits were inherited through the blood dates as far back as Aristotle. History Machine offering blood-type based fortunes In a logical extension of this system, those with type AB are a mix of stereotypical A and B traits. Overview Īccording to popular belief, people with type A blood are friendly and kind, people with type B are spontaneous and creative, and people with type O are confident and aggressive. Some studies suggest that there is a statistically significant relationship between blood type and personality, although it is unclear if this is simply due to a self-fulfilling prophecy. Although research into the causal link between blood type and personality is limited, the majority of modern studies do not demonstrate any statistically significant association between the two. The popular belief originates with publications by Masahiko Nomi in the 1970s.Īlthough some medical hypotheses have been proposed in support of blood type personality theory, the scientific community generally dismisses blood type personality theories as superstition or pseudoscience because of lack of evidence or testable criteria. One of the reasons Japan developed the blood type personality indicator theory was in reaction to a claim from German scientist Emil von Dungern, that Blood type B people were inferior. The theory is generally considered a superstition by the scientific community. The blood type personality theory is a pseudoscientific belief prevalent in Japan which states that a person's blood group system is predictive of a person's personality, temperament, and compatibility with others. Not to be confused with Type A and Type B personality theory.
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