Nikolas Karalis and Anton Sirota’s publication in Nature Communications uses NeuroNexus standard 16-shank probes (A16x1-2mm-50-177) in prefrontal cortex plus custom designed polytrodes (A1x64-Poly2-6mm-23s-160) in both prefrontal cortex and hippocampus of behaving mice. They recorded single units and measured LFPs both for current source density (CSD) analysis, and to study the oscillations coupled to breathing. Control recordings were done during optogenetically induced ripples. Read more about their results.