Memory coherence is the degree of meaningful connectedness of knowledge. If you visualize knowledge as a semantic network, coherence will reflect the quality of connectedness between proximal nodes of the network. Concepts such as cat and dog are semantically close. Reversely, cat and algebra are usually remotely connected. High knowledge coherence improves memory via consolidation in sleep. It reduces knowledge interference and favors memory consistency. Coherent knowledge enables fast thinking. Reliance on the learn drive leads to learning based on high coherence. Reliance on schooling leads to knowledge of low coherence.
Compare: Memory consistency