Chart 1. Survey 2 Score of Item h (Serious) by Gender and Age
The issue concerning the difference of human personality affected by gender and age, have been explored in the fields of personality psychology and social psychology. Although some people argue that personalities are affected by gender and age, and the differences are nonlinear (Soto, John, Gosling & Potter, 2011; Kawamoto et al., 2015), others argue that they are not affected (Costa, Terracciano & McCrae, 2001). In any case, many researchers seem to agree upon the existence of differences, at least self-reported. We also believe that there are such differences.
Our study has several points to be improved. Firstly, the participants in this study were limited to Japanese populations only. It is necessary to examine whether the same results can be obtained in samples of other countries. Secondly, we used the 2,000-population AI training data, but this is a relatively small sample size; 10,000 or more persons are desirable. Lastly, researchers have not yet found an appropriate method to utilize AI for personality psychology. In this pilot study, we adopted a facial recognition method (Nakamura & Iwasada, 2017), but better algorithms should be considered.