Ivan Pavlov Saliva

In the early twentieth century, Russian psychologist Ivan Pavlov did noble prize winning work on digestion. While studying the role of saliva in dogs digestive process he stumbled upon a phenomenal he labelled psychic reflexes. While an accidental discovery he had the foresight to see the importance of it. Pavlov's dogs restrained in an experimental chamber were presented with meat powder and they had their saliva collected via a surgically implanted tube in their saliva glands.
Over time he noticed over time the dogs who begun salvation before the meat powder was even presented whether it was by the presence of the handler or nearly by a clicking noise produced by the device that was distributing the meat powder. Fascinated by this finding