Interpersonal Synchrony in Social Interaction

Interpersonal synchrony refers to the temporal alignment of behaviour, physiology and neural activity between individuals engaged in social exchange. It manifests in coordinated gestures, matched speech rhythms, shared affective responses and, more recently, in coupled brain dynamics measured via hyperscanning techniques. Synchrony is posited to facilitate rapport, empathy and collaboration by creating a shared temporal framework that underpins mutual prediction and adaptive coordination. Across developmental, clinical and organisational contexts, synchrony has been linked to enhanced communication, stronger therapeutic alliances and improved team performance. From an evolutionary perspective, collective rituals, music and dance exemplify how synchrony can reinforce social bonds and group cohesion through shared intentionality. Mechanistically, interpersonal synchrony may emerge from mutual entrainment of sensorimotor and limbic circuits, which in turn support the co-construction of meaning and affective resonance. Observational paradigms, turn-taking tasks and naturalistic exchanges all demonstrate that people spontaneously and often implicitly attune to one another. Such attunement is shaped by familiarity, social status and cultural conventions. Recent advances in multi-person neuroimaging have begun to uncover the neural signatures of synchrony, revealing both symmetric and asymmetric patterns of interbrain coupling that reflect complementary roles such as leader–follower dynamics. The study of interpersonal synchrony thus offers a unifying framework for understanding how temporal alignment at multiple levels fosters social connectedness and collective intelligence.

Research from Nature Portfolio

Hyperscanning studies have demonstrated that affiliative partners exhibit selective neural synchrony during naturalistic interaction. Using dual-EEG recordings, researchers found that romantic couples—but not strangers—show increased gamma-band coupling in temporal-parietal regions when engaged in free conversation. This synchrony correlated with moments of shared gaze and positive affect, underscoring the role of nonverbal cues in anchoring interbrain coordination. The work highlights how attachment bonds provide a neural template for coupling and suggests that brain-to-brain alignment is both context-dependent and modulated by relationship quality.

Interpersonal Synchrony in Social Interaction publication trend

The graph below shows the total number of articles in interpersonal synchrony in social interaction across all publications each year (not limited to Nature Index journals).

Technical terms

Interpersonal synchrony: Temporal alignment of behaviour, physiology or neural activity between interacting individuals.

Hyperscanning: Simultaneous recording of brain activity from two or more participants during social tasks.

Brain-to-brain coupling: Measure of functional connectivity or coherence between the neural signals of different brains.

Shared intentionality: Joint commitment to a common goal that enhances coordination and collective agency.

References

1. Enhancing Brain–Computer Interface Performance by Incorporating Brain-to-Brain Coupling. Cyborg and Bionic Systems (2024).
2. A Brain‐To‐Brain Mechanism for Social Transmission of Threat Learning. Advanced Science (2023).
3. Hyperscanning: A Valid Method to Study Neural Inter-brain Underpinnings of Social Interaction. Frontiers in Human Neuroscience (2020).
4. Brain-to-Brain Synchrony during Naturalistic Social Interactions. Scientific Reports (2017).