The voltage is measured using two voltage electrodes placed near the tissue epithelium.

A Absolutely. And you can see its monumental and columnar, but it has this weight and volume.

This voltage is cancelled out by injecting current, using two other current electrodes placed away from the epithelium.

This is the Devils Tower in Wyoming, which is a columnar basalt formation that most of you probably know from Close Encounters.

So that suggests to us that our sense of self does not end at the last layer of the epithelium of our bodies, but it ends at the last layer of electrons of the tools that we're commanding with our brains.