Figure 8: A conceptual predictive model centring at the medial posterior DMN. The medial posterior DMN behaves like a predictive system, with its dorsal part associated with an attentional system (comprising FPCN regions such as the IPS, middle and lateral frontal cortices) and its ventral part associate with a reactive system (comprising regions such as anterior insula) (Tops et al., 2014). The connectivity from each module is derived from our studies, with the pink colour indicating being stronger in difficult conditions, and blue colour indicating being stronger in easy conditions. The (directed) connectivity pattern from our result suggests that external and internal information is exchanged by the reciprocal loop between the vPCu and dPCu. This exchange of information might support the predictive coding theory which emphasises that external information is always inferred (rather than simply being represented from a bottom-up direction) based on an internal belief of the world (prediction).
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