From the described experiment it is clear that the mere act of eating, the food even not reaching the stomach, determines the stimulation of the gastric glands.
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About Ivan Pavlov
Ivan Pavlov was a 19th-century Russian physiologist. Ivan Petrovich Pavlov was a Russian and Soviet experimental neurologist and physiologist known for his discovery of classical conditioning through his experiments with dogs. Pavlov also conducted significant research on the physiology of digestion, for which he was awarded the Nobel Prize in Physiology or Medicine in 1904. Read more on Wikipedia →