The age‐related reduction in synchronicity between the CA1‐subiculum transition area and the TEC that we have observed here dovetails with this known progression of tau pathology (Lace et al., 2009) and another recent report showing that the subiculum was the only subfield to show reduced FC in patients diagnosed with mild cognitive impairment (de Flores et al., 2017). The gene discussed is MAPT; the disease is Cognitive impairment.