Evidence supporting the blood type-personality relation. Are they legit ?

Introduction

This page is the 2nd part of a study of articles.

Blood type and personality by Mary Rogers and A. Ian Glendon

A Pilot Study Using AI for Psychology: ABO Blood Type and Personality Traits by Masayuki Kanazawa

Recent findings supporting the relation.

Since Furukawa, many different researchers have done experiments with various tests and methods to try and prove that our blood type can be predictive of our personality.

An experiment done using the high school personality questionnaire, for A, found As to be more tender minded than others.

This experiment was also criticised.

Another using the 16 Personality Factor on Australian residents found As to have significantly higher self-sentient integration and anxiety than Os.

However, they weren’t able to find any significant differences comparing with the other blood types.

A researcher called Eysenck did several experiments comparing the traits of populations and their blood type proportions finding :

• More emotional behaviours in Bs than As
• ABs to be more introverted than others
• The proportion of Bs varying consistently with anxiety and neuroticism of the population
• The proportion of ABs varying consistently with introversion of the population

Extraversion

In 1967, experiments found O and ABs to have significantly higher extraversion while As and Bs had significantly higher introversion.

7 years later another researcher found Bs to have high neuroticism, As to be more emotionally vulnerable and ABs to have high introversion.

This contradicts research done by the same person in the same year that said ABs were aggressive, open and extraverted. It also contradicts the research done in 1967 presented above.

Later, research started including gender differences and found O females to be more extraverted than A females while O males were less than A males.

Regarding neuroticism, a study found females to have higher neuroticism than males and Bs to have higher neuroticism than other blood types.

A study in 2001 used the MBTI ( Myers-Briggs type indicator ) and found :

• O : extraverted
• A : introverted
• B : independent
• AB : intuitive

Summary of these findings

Many of the results were inconsistent and some would even contradict each other.

In addition, most experiments are criticised as being poorly designed, having inconsistent methodology and problematic interpretations.

Next Part :

part 1 : The root of the Blood type – personality relation