It is widely documented that psychological distress is negatively associated with social networks involvement. However, despite the theoretical postulations that social networks are crucial for alleviating psychological distress, no study has yet empirically confirmed the causality of this relationship. Thus, we used the random-effects generalized least squares method to investigate the effect of one- and two-year lagged values for involvement in social networks on psychological distress. Nine years of longitudinal data were extracted from a nationally representative survey in Japan ("The Longitudinal Survey of Middle-aged and Older Persons"). We utilized the Kessler 6 (K6) score to measure psychological distress among 15,242 respondents aged 50-59 years in the baseline year (2005), and stratified participants into three layers of social networks: inner (well-established friendship ties and participating in hobby activates), intermediary (neighborly ties), and outer (involvement in community activities). We found highly significant and negative associations between all three layers and K6 scores, with the strongest association being for the inner layer. We further observed that one-year lagged involvement in the inner and intermediary layers led to significantly lower K6 scores. However, the protective influences of social networks generally diminished over time. In addition, the protective influences of social network involvement on psychological distress were stronger for women than for men. Furthermore, involvement in social networks was especially important for improving mental health among people with psychological distress. These findings would be important for policymaking to prevent mental health deterioration among middle-aged adults in Japan.

The present study examines the relationships between changes in bonding and bridging types of social capital and depressive states among middle-aged adults in Japan using a nationally representative sample. Data was collected from a nationwide, population-based survey conducted from 2005 to 2013 in nine annual waves. A total of 16,737 middle-aged men and 17,768 middle-aged women provided data. They reported about depressive states, measured by Kessler 6 scores, and bonding and bridging types of social capital, measured by reported participation in different social activities. Latent growth modeling was conducted to examine relations between changes in bonding and bridging types of social capital and depressive states within individuals across the nine waves. The results showed that, for both men and women, increases in bonding social capital were associated with decreases in depressive states, while changes in bridging social capital were not related to changes in depressive states. In addition, the results showed that changes in bonding social capital, but not bonding social capital at the baseline, affected changes in depressive states. Future studies should take changes in social capital as an independent variable into consideration.

The term sociosexuality is used to describe individual differences in people's willingness to engage in uncommitted sexual relationships. The authors developed the revised Sociosexual Orientation Inventory in Japanese (SOI-J) to assess sociosexuality. In addition, we examined the effect of sociosexuality on flirting behaviors. In study 1 and study 2, we translated the revised Sociosexual Orientation Inventory into Japanese and confirmed its reliability and validity. The results of study 3 showed that male sociosexuality had an effect on male and female flirting behaviors. On the other hand, the results showed that female sociosexuality had no effect on male and female flirting behaviors. These results suggest that relationship initiation is controlled by females.

Introduction: Previous studies found that about 10–30% of terrorist attack survivors suffer mental disorders such as posttraumatic stress disorder (PTSD) which persist up to 10 years. However, little is known about whether the effects of terrorism on mental health could last for a longer period or whether physical symptoms and secondary victimization are associated with the persistence of mental disorders. Method: A questionnaire survey was conducted with the victims of the Tokyo subway sarin attack in March 1995 (N = 299). Victims’ physical and ophthalmic symptoms, secondary victimization, and posttraumatic stress symptoms were surveyed. For comparison, those who have experienced a stressful event were surveyed with the same instruments as of victims’ survey except secondary victimization. Results: Results indicated that 21.3% of the male and 36.1% of the female victims were in the high-risk group for posttraumatic stress symptoms (PTSS), which did not differ from those of the comparison group. However, victims had physical and ophthalmic symptoms of greater severity than the comparison group. Moreover, we found that PTSS was strongly associated with physical symptoms and secondary victimization. Discussion: There is a need to develop a support system that would be helpful in reducing mental health suffering of terrorist victims. Providing regular physical checkups and building support for those who experience life changes caused by victimization are suggested.

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