A Narrative Review of Neural Synchrony and Oscillations in Shared Consciousness of Self and Other in Romantic Intimacy

This narrative review explores the potential neurophysiological correlates of the subjective experience of shared consciousness in romantic intimacy, synthesizing evidence from hyperscanning (simultaneous recording from two brains) EEG (electroencephalography), fMRI (functional magnetic resonance imaging), and MEG (magnetoencephalography) studies. It examines how neural synchrony, specifically through shared gaze, emotional alignment, and coordinated rhythms, correlates with the experience of connection in romantic intimacy. This review explores how these neural patterns relate to the subjective feeling of being “in sync” with a partner and their potential role in supporting social bonding and emotional regulation. It further addresses the bidirectional relationship between neural synchrony and relational depth, considering how romantic attachment both shapes and is shaped by dynamic inter-brain coupling. Long-term neuroplastic effects emerging from sustained dyadic co-regulation are also considered. Beyond reviewing the data, this article discusses theoretical questions regarding the boundaries between self and partner, considering whether romantic connection might reflect a form of shared cognitive processing. In doing so, this review integrates neuroscientific data with frameworks from enactivism, intersubjectivity, and the extended mind thesis, offering a rigorous, interdisciplinary perspective on the potential neural foundations of romantic intimacy. Overall evidence from EEG and functional near-infrared spectroscopy (fNIRS) hyperscanning suggests that transient neural synchrony correlates with subjective intimacy, though causal mechanisms remain to be fully established.