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Since social support and co\u2010rumination are both dyadic processes, it is important to examine physiological responses during these conversations in a dyadic manner. Little research has examined physiological synchrony of the sympathetic nervous system (SNS) during social support conversations or co\u2010ruminative conversations. The current research capitalizes on an experimental manipulation of co\u2010rumination using a sample of close friends (147\u2009dyads) and romantic partners (113\u2009dyads) to examine physiological covariation in the context of support. Across both samples, dyads exhibited significant physiological covariation in pre\u2010ejection period reactivity (PEP). Contrary to our hypothesis, dyads in the co\u2010rumination condition did not show more covariation. Close friend dyads did, however, exhibit more covariation as compared to romantic dyads. We also found significant variability in physiological covariation across dyads, with a minority of dyads exhibiting negative covariation of PEP reactivity. The homogeneity of the samples limits the generalizability of the findings and highlights the need for more diverse samples in future work. These findings underline the need for further exploration into the mechanisms that contribute to distinct patterns of physiological synchrony, the conditions in which negative synchrony occurs, and what predicts especially strong positive synchrony. This work extends our understanding of physiological synchrony of the sympathetic nervous system during support conversations and emphasizes the importance of considering heterogeneity in physiological processes.<\/jats:p>","DOI":"10.1111\/psyp.14554","type":"journal-article","created":{"date-parts":[[2024,4,1]],"date-time":"2024-04-01T23:54:32Z","timestamp":1712015672000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Physiological synchrony in supportive discussions: An examination of co\u2010rumination, relationship type, and heterogeneity"],"prefix":"10.1111","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8672-8681","authenticated-orcid":false,"given":"Ana M.","family":"DiGiovanni","sequence":"first","affiliation":[{"name":"Department of Psychology Columbia University  New York New York 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