At the end of the eighteenth century, scientists could observe electricity in lightning and static sparks, but they had no reliable way to produce it. Without a steady source of electrical current, experiments on the nervous system were difficult and often impossible.
Italian physicist Alessandro Volta investigated whether electricity originated in living tissue or from the metals used in experiments. While testing different combinations of metals, he stacked alternating discs of zinc and copper separated by cloth soaked in salt water and created the voltaic pile—the world’s first practical battery.
For the first time, scientists had a dependable source of electricity that could be used repeatedly in the laboratory. This transformed research not only in physics but also in physiology, allowing investigators to study nerves and muscles with unprecedented precision.
Modern neurotechnology still depends on the ability to generate controlled electrical currents. From laboratory stimulators to deep brain stimulation and cochlear implants, the lineage can be traced back to Volta’s simple stack of metal discs.
Last Updated on October 6, 2026 | Published: July 3, 2026