Ivan Pavlov Studied the Reflexive Flow of Saliva in Dogs

Multiple Choice

Ivan Pavlov studied the reflexive flow of saliva in dogs. He used meat powder to trigger the salivation. It was later observed that the salivation occurred even before the food was placed in its mouth-at the sight of the food dish. The food dish acted as a(n) ________.

A) unconditioned response
B) unconditioned stimulus
C) conditioned response
D) conditioned stimulus