Fig. 2
From: Dendritic calcium spikes are clearly detectable at the cortical surface

I h contributes to the generation of passive current in L1. a Schematic diagram of the experiment. b CSD profiles of evoked potentials before (left) and after application of 500 μM ZD7288 to the cortical surface (right), averaged over 100 measurements. c Summary of the CSD amplitude at 100 to 300 μm below the pia before and after ZD7288 application at the cortical surface (all p < 0.05, Wilcoxon signed-rank test)