eng Science and Education Publishing Research in Psychology and Behavioral Sciences 2333-438X 2025-12-30 13 1 16 22 10.12691/rpbs-13-1-3 RPBS20251313 article Rae Na Kang kangraena@gmail.com 1 2 Keiko Otake 2 Hidefumi Hitokoto 2 Department of Integrated Psychological Sciences, Kwansei Gakuin University, Nishinomiya, Japan Positivity resonance (PR), the shared experience of positive affect, mutual care, and behavioral synchrony, has been associated with well-being in Western contexts, yet its mental health benefits in non-Western cultures remain underexplored. This study developed a Japanese version of the Positivity Resonance Scale (PRS) for interactions with ¡°familiar others¡± and examined its links to subjective happiness, loneliness, and depression. Data were collected across three survey waves: Time 1 used an independent cross-sectional adult sample (N = 934), while Time 2 (N = 318) and Time 3 (N = 254) followed the same Japanese university students longitudinally. Factor analyses supported a one-factor structure consistent with the original PRS, showing excellent internal consistency (¦Á = .93¨C.94) and good test¨Cretest reliability (ICC = .63). PR correlated positively with happiness and negatively with loneliness and depression, and these associations remained significant after controlling for positive affect. These findings suggest that PR is a crucial interpersonal emotional process supporting well-being, even in a collectivistic cultural context. https://pubs.sciepub.com/rpbs/13/1/3/rpbs-13-1-3.pdf positivity resonance familiar others subjective happiness loneliness depression well-being Japan