Citation of neuroscience
"I had arranged electrodes on the optic nerve of a toad in connection with some experiments on the retina. The room was nearly dark and I was puzzled to hear repeated noises in the loudspeaker attached to the amplifier, noises indicating that a great deal of impulse activity was going on. It was not intil I compared the noises with my own movements around the room that I realized I was in the field of vision of the toad's eye and that it was signaling what I was doing."
-E. D. Adrian
Note: This was in 1928 and it wasn't known that electrical processes take place inside the brain (or in nervecells - the same thing).