Fig. 4: Brain state dynamics during movie viewing.

Brain state dynamics during viewing of an emotionally evocative movie for non-melancholic participants (upper panel) and melancholic participants (lower panel). Brain states are colour-coded according to the legend on the far right (mirroring Fig. 3, showcasing brain state topology). The temporal consistency across participants is presented as a timeline in the lower aspect of each panel. The black horizontal line represents the within-group state synchronisation based on the null model. The grey-shaded region represents the between-group null distribution (section ‘Materials and Methods’). Periods during which group synchrony is greater than the top 5% of these two null distributions are represented by an upwards-facing arrow. Periods of exended group synchrony for the non-melancholic group are A scene 1: state 3, B scene 6: states 4 and 6, C scene 10: state 1 and D scene 19: state 6. Periods of protracted group synchrony for the melancholic group are E scene 9: state 5. Further details of these scenes and group differences can be found in Supplementary Table 1.