"Hippocampal circuits" refers to the interconnected network of nerve cells in the hippocampus, a part of the brain involved in learning, memory, and spatial navigation. Full definition
Thus, the continuous addition of new neurons both degrades existing information stored in hippocampal circuits and simultaneously provides substrates for new learning. (science.sciencemag.org)
There has been notable progress recently in dissecting the function of hippocampal circuits in animal models and also in characterizing the fundamental computations involved in human memory formation. (cogneurosociety.org)
[55] More recent work showed, that DBS upregulates genes involved in synaptic function, cell survival, and neurogenesis [56], making some first steps at explaining the restoration of hippocampal circuit function. (en.wikipedia.org)