The Temporal Dynamics of Social Interaction

Social interactions require integrating information across multiple timescales, yet the underlying mechanisms remain unclear. We review evidence suggesting that intrinsic neural timescales (INTs) may be a key mechanism enabling this integration, with the right temporoparietal junction (rTPJ) serving as a critical hub during social interactions. INTs form a cortical hierarchy for multi-scale temporal processing, and differences in this hierarchy are linked to social impairments across neuropsychiatric conditions. The rTPJ dynamically integrates fast mirroring and slow mentalizing processes; inter-brain synchrony there predicts success in social interactions, while mismatched timescales between individuals cause communication breakdowns. We propose that this INT and rTPJ framework unifies dual-process theories within a single neurophysiological mechanism, providing a novel, testable account of social interactions and their impairments.