Fig. 6: Default network (DN) and hippocampus (HC) coupling signatures are linked to narrative events and external descriptions.

Using partial least squares regression (PLS-R) modeling, we identified coherent cross-associations of neural responses with both data-led semantic contexts and hand-selected annotations. Each row presents results for one derived PLS-R solution corresponding to one of the four brain states (cf. methods). a Contributions of the 19 left and 19 right subregions of the HC. The radius ranges from 0 (center) to 1.6 (outer circle). Generally, left and right hemispheres play different roles in the neural signatures. b The DN subregion contributions, covarying with the HC, highlight the prefrontal cortex (PFC). c The semantic context elements that are best explained by each DN&HC coupling signature. The underlying contextual events were related to various movie characters: 1. A man who made money from T-shirts that Gump used when running; 2. Lieutenant Dan; 3. Gump’s Mom; 4. Jenny sang songs nakedly. d Among the 52 external descriptions, the three strongest annotation entries related to the three categories: “emotion”, “place”, and “others”. The contributions of places were the largest. H head, B body, T tail, CA dentate gyrus and Cornu Ammonis, Para parasubiculum, HATA hippocampal amygdala transition area, HP hippocampus, PrS presubiculum, Sub subiculum, ML molecular layer; DG granule cell layer of the dentate gyrus (GC-DG-ML). Source data are provided as a Source Data file.