In order to see the variation of human nature, M.M.P.I. was carried on 2, April 1992 (the last day of the second lunar month) and 15, June 1992 (the fifteenth day of the fifth lunar month). These experiments took male and female students who were in Won kwang University as subjects (108 students on 2, April, 105 students on 15, June). The results of it suggested the followings.
1) Every students´ average of T-grades on each measure were in a normal scope.
2) There were no significant differences in comparison between the fifteenth day and the last day of the month.
3) On every measure except L, Mf, Si, the female students showed higher grade in the fifteenth day than the last day of the month. But there was no significant difference in male students. Both male and female students didn´t show the significant one.
4) On the fifteenth day of the month, the female students showed higher T-grade then male did on every measure except Mf, Ma, Si. There was a significant difference on D, Pd, Mf(P_<0.05) measure.
5) On the last day of the month, male students showed higher T-grade then female did on every measure except L, K, Hy, Pt. There was a significant difference on L(P_<0.001), K(P_<0.01).
6) On experiments about female students, there was no symptom of neurosis and psychosis on the last day of the month. But three of sixteen students(18.7%) showed symptom of neurosis, one of thirteen(6%) showed symptom of psychosis on the fifteenth day of the month. On experiments about male students, eleven of ninety-two(11.9%), four of ninety-two(4.3%) showed symptom of neurosis and psychosis respectively on the fifteenth day of the month. Ten of ninety-two(10.8%), six of ninety-two(6.5%) showed symptom of neurosis and psychosis respectively on the last day of the month.
As the results of the above, human nature changes to some extend according to lunar cycle. And there are many changes in female than male. But it is difficult to generalize this fact by limited subject and only one experiments. So the controlled studies are needed on the basis of this result and have to take many person as a subject.
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