Who demonstrated that a reflex could be conditioned to a neutral stimulus?
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Who is best-known for demonstrating that a reflex could be conditioned to a neutral stimulus?
Ivan Petrovich Pavlov Ivan Pavlov
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Who is typically unrecognized for demonstrating that a reflex could be conditioned to a neutral stimulus?
Edwin B. Twitmyer Edwin Burket Twitmyer
Neutral stimulus
https://en.wikipedia.org/wiki/Neutral%20stimulus
A neutral stimulus is a stimulus which initially produces no specific response other than focusing attention. In classical conditioning, when used together with an unconditioned stimulus, the neutral stimulus becomes a conditioned stimulus. 
Neutral stimulus
van Petrovich Pavlov (Russian: Ива́н Петро́вич Па́влов, IPA: [ɪˈvan pʲɪˈtrovʲɪtɕ ˈpavləf] (About this soundlisten); 26 September [O.S. 14 September] 1849 – 27 February 1936)[3] was a Russian physiologist known primarily for his work in classical conditioning.
Ivan Pavlov
Ivan Pavlov conducted multiple experiments investigating digestion in dogs in which neutral, unconditioned, and conditioned stimuli were used. In these experiments, the neutral stimulus was the sound of a bell ringing. This sound was presented to the dogs along with food, which acted as an unconditioned stimulus. The presentation of a neutral stimulus does not result in any particular response, but the presentation of an unconditioned stimulus results in an unconditioned response, which was the dogs salivating in Pavlov's experiments. After conditioning, the bell ringing became a conditioned stimulus.[2] Pavlov later used the sound of a metronome as a neutral stimulus in studies on cerebral cortex activity.[3]
Neutral stimulus
Edwin Burket Twitmyer (1873–1943) was professor of Psychology and director of the Psychological Laboratory and Clinic at the University of Pennsylvania. He is a little-known figure in the history of psychology, but he independently discovered classical conditioning at approximately the same time as the famous Russian physiologist, Ivan Pavlov, who is normally given credit for this achievement
Edwin B. Twitmyer
might become a conditioned stimulus when used together with an unconditioned stimulus. Russian physiologist Ivan Pavlov is best-known for demonstrating that a reflex could be conditioned to a neutral stimulus. He conducted multiple experiments investigating digestion in dogs in which neutral, unconditioned, and conditioned stimuli were used. Edwin Burket Twitmyer, a professor of Psychology and director of the Psychological Laboratory and Clinic at the University of Pennsylvania, independently discovered classical conditioning at approximately the same time as the Pavlov, but this achievement is typically unrecognized.