sentences:  In reality, the reaction of muscles to electrical stimulation was already established at the time.Galvani was investigating the effects of distant atmospheric electricity (lightning) on prepared frog legs when he discovered the legs convulsed not only when lightning struck but also when he pressed the brass hooks attached to the frog’s spinal cord to the iron railing they were suspended from.In his laboratory, Galvani later discovered that he could replicate this phenomenon by touching metal electrodes of brass connected to the frog’s spinal cord to an iron plate.