Editing Classical conditioning (section)

===Pavlov's research===
The best-known and most thorough early work on classical conditioning was done by [[Ivan Pavlov]], although [[Edwin Twitmyer]] published some related findings a year earlier.<ref name="Pavlov">{{cite book |vauthors=Pavlov IP |orig-year=1927 |year=1960 |title=Conditional Reflexes |location=New York |publisher=Dover Publications |url=http://psychclassics.yorku.ca/Pavlov/ |access-date=2007-05-02 |archive-date=2020-09-21 |archive-url=https://web.archive.org/web/20200921213926/http://psychclassics.yorku.ca/Pavlov// |url-status=live }} (the 1960 edition is not an unaltered republication of the 1927 translation by Oxford University Press )</ref> During his research on the [[physiology]] of [[digestion]] in dogs, Pavlov developed a procedure that enabled him to study the digestive processes of animals over long periods of time. He redirected the animals' digestive fluids outside the body, where they could be measured.

Pavlov noticed that his dogs began to [[Saliva|salivate]] in the presence of the technician who normally fed them, rather than simply salivating in the presence of food. Pavlov called the dogs' anticipatory salivation "psychic secretion". Putting these informal observations to an experimental test, Pavlov presented a stimulus (e.g. the sound of a [[metronome]]) and then gave the dog food; after a few repetitions, the dogs started to salivate in response to the stimulus. Pavlov concluded that if a particular stimulus in the dog's surroundings was present when the dog was given food then that stimulus could become associated with food and cause salivation on its own.