Behavioral variability in physiological synchrony during future-based conversations between romantic partners.

Physiological synchrony-or similarity between two people's physiological responses-is thought to have important consequences for health and well-being and has been observed in social relationship contexts. The present study investigated variability in dyads' physiological synchrony as a function of both partners' behaviors during an emotionally salient discussion. We examined concurrent covariation in cardiac interbeat intervals in a sample of young adult romantic couples (N = 79 dyads) who discussed the coordination of a personal goal with the future of their relationship (data collected from 2013 to 2015). Partners assigned to be disclosers revealed hypothetical good news (e.g., a dream job offer) with their partner, the responder, who reacted to this disclosure. To understand covariation-behavior associations, we examined three motivationally relevant behaviors that may underlie synchrony based on people's role in the discussion. We found significant variability in how much couples experienced covariation, and covariation depended, at least in part, on people's behaviors during the discussions. When disclosers spoke more (a behavior associated with less satisfying relationships and less positive partner perceptions), dyads experienced less physiological covariation. Furthermore, when responders showed more neglect and withdrawal, and when both partners displayed less positive emotion, dyads experienced less physiological covariation. These findings underscore couples' physiological synchrony as a heterogeneous process that can emerge with the presence of greater behavioral and emotional positivity. (PsycInfo Database Record (c) 2025 APA, all rights reserved).