Summary: When two people click, their bodies often fall into sync—literally. A new comprehensive review examines interpersonal physiological synchrony: the tendency for heart rates, heart-rate variability (HRV), electrodermal activity, and other physiological signals to align between people during social interaction. The authors argue that this alignment is not merely a byproduct of shared activity, but a dynamic, context-sensitive form of biological attunement that helps shape empathy, cooperation, and social bonding.
The review shifts the research focus from a simple yes-or-no question about whether synchrony occurs to deeper questions about when, how, and why physiological alignment emerges. It highlights that synchrony is multi-layered and time-varying: it can intensify during moments of collaboration, change during competition or stress, and spread across larger social groups. The authors call for more rigorous, multimodal studies to map the links between physiology, brain activity, and behavior.
Key Facts
- The Indicators: Common measures of physiological synchrony include aligned heart rate, heart-rate variability (HRV), and electrodermal activity (skin conductance).
- Context Matters: Synchrony is not static. It fluctuates over the course of an interaction and depends on situational context—cooperation, competition, shared creativity, or stress can increase, decrease, or reconfigure alignment.
- Beyond the Duo: Research is expanding from dyadic pairs to groups, investigating how group-level synchrony supports teamwork, social cohesion, and collective behavior.
- Empathy and Social Connection: Physiological alignment is a leading candidate mechanism for empathy and mutual understanding, linking bodily states to social perception and responsiveness.
- Call for Multimodal Research: The review recommends integrating physiological recordings with neural imaging and behavioral tracking to build a more complete, time-sensitive map of social interaction.
Source: Bar-Ilan University
Understanding how people connect is more complex—and more intriguing—than many earlier models suggested.
A new review published in Nature Reviews Psychology synthesizes recent advances in the study of interpersonal physiological synchrony, the phenomenon in which multiple people’s physiological signals coordinate over time during social encounters. The review gathers findings across studies and identifies both consistent patterns and important sources of variability.
Interpersonal physiological synchrony refers to temporal coordination across individuals in signals such as heart rate, HRV, and skin conductance. While many studies document synchrony in social pairs and groups, results have been mixed. The review suggests that apparent inconsistencies often reflect methodological differences, contextual effects, and individual variability rather than the absence of a meaningful phenomenon.
The authors emphasize treating synchrony as a dynamic process unfolding across interactions rather than a single static measure. Moments of heightened coordination can emerge and dissolve as people move between cooperation, conflict, shared attention, or creative collaboration. Capturing these temporal dynamics requires longitudinal and time-resolved analysis methods rather than single summary statistics.
The review—invited and authored by Prof. Ilanit Gordon (Department of Psychology, Bar-Ilan University) and Prof. Ronny Bartsch (Department of Physics, Bar-Ilan University)—highlights methodological improvements needed to advance the field. These include preregistered replications, larger and more diverse samples, multimodal designs that combine physiological, neural, and behavioral measures, and experimental approaches that can test causal mechanisms (for example, using controlled biofeedback or interactive manipulations).
Looking ahead, the field is moving beyond dyads to ask how synchrony operates in groups and networks. Group synchrony studies promise insight into how biological alignment supports teamwork, collective decision-making, and the formation of social coalitions. The review also connects synchrony research to clinical questions, noting that patterns of asynchrony may illuminate social processing differences in conditions such as autism or social anxiety.
Key Questions Answered:
A: Research shows synchronized physiological patterns can appear in romantic partners, but synchrony is not limited to romance. Close relatives, friends, and effective teammates also show coordinated autonomic responses when they are engaged and attuned to one another.
A: Synchrony can be encouraged through shared rhythmic activities. Practices like coordinated breathing, singing together, or moving in step often help prime physiological alignment and can increase perceived trust and cooperation.
A: Reduced synchrony can indicate social friction or reduced rapport. In research and clinical contexts, patterns of asynchrony are being used to better understand social processing challenges in conditions such as autism spectrum disorder or social anxiety.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- The full journal paper was reviewed for this summary.
- Additional context and clarification were added by staff editors.
About this physiology and neuroscience research news
Author: Elana Oberlander
Source: Bar-Ilan University
Contact: Elana Oberlander – Bar-Ilan University
Image: The image is credited to Neuroscience News
Original Research: Closed access.
“Correlates of interpersonal physiological synchrony and sources of empirical heterogeneity” by Ilanit Gordon & Ronny P. Bartsch. Nature Reviews Psychology
DOI: 10.1038/s44159-026-00535-4
Abstract
Correlates of interpersonal physiological synchrony and sources of empirical heterogeneity
Interpersonal physiological synchrony denotes the temporal coordination of physiological processes among multiple individuals and is often described as an emergent property of social interaction, cooperation, and shared attention. Despite decades of study, the psychological meaning and boundary conditions of synchrony remain ambiguous.
This review synthesizes interpersonal physiological synchrony findings, giving particular attention to key review articles and empirical studies published between 2020 and 2024. It categorizes correlates of synchrony into social-oriented (rapport, empathy), performance-oriented (task coordination, joint success), and self-oriented (individual stress or arousal) domains, and identifies critical methodological issues within each area.
The authors discuss theoretical and methodological sources of empirical heterogeneity across the literature, including differences in measurement techniques, analytic choices, experimental contexts, and participant samples. They conclude with hypotheses and concrete design recommendations—such as multimodal recording, time-resolved analyses, and causal experimental manipulations—aimed at moving the field toward a more rigorous, nuanced, and verifiable understanding of interpersonal physiological synchrony.