Is it possible to measure the neuron activity on body parts like the back or the arm? Or is this done already?
Of course neuron activity can be measured on the scalp using an EEG. I wonder if similar technology could be used to do the same on other parts of the body.
I know there is EMG which measures muscle activity and that's also easier to measure as the voltages are multiple orders of magnitude higher. But I imagine that one could get much richer data by directly sampling neuron activity.