I'm not sure if conductivity matters. Bodily fluids are also conductive, yet don't seem to interfere. More importantly, neurons use ion gradients across their

I'm not sure if conductivity matters. Bodily fluids are also conductive, yet don't seem to interfere. More importantly, neurons use ion gradients across their membranes to conduct signals. It's not electrons flowing along, as it is for wires. While the magnetic field created by thousands of neurons firing in concert can be picked up using wires (EEG, ECG), and neurons can be induced to fire with electric shocks, I actually doubt anything would happen if you were to connect two neurons by wire. At the very least, the wires would need to have contact with the axons (neuron terminals). A neuron can be a meter long, but it is isolated by a fatty membrane along its body.