At a poster session at the 2018 Neural Interfaces Conference, I talked to James Eles about his poster on the in vivo imaging of calcium activity during electrode implantation. They were able to image the firing of calcium neurons many times higher than their usual levels which is a sign of damage

In vivo imaging of neuronal calcium during electrode implantation: Spatial and temporal mapping of damage and recovery JR Eles, AL Vazquez, TDY Kozai, XT Cui - Biomaterials, 2018