MCU of Ivan Pavlov speaking, narrator introduces him as music plays. Narrator talks about the studies Pavlov did on the brain. Screen fades, cut to shot of machine. Man walks into scene. Cut to close up of him putting instrument to dog’s face. Shot of dog with tube inserted in saliva glands, eating food. Various shots of dogs face with drips coming out of tube. Shot of diagram of dogs mouth, lines pointing to brain, showing saliva glands and how active they are. Diagram shows path of saliva reaction. Screen fades to black. Cut to shot of dog wagging tail as narrator describes Pavlov’s discovery of unconditioned reflexes. closer shot of dog panting. Shot of dog on table strapped up, man stands next to him holding food as dog eats. Cut to shot of dogs face with tube. Shot of man holding test tube. Screen fades, shots of man feeding dog meat. Shot of dog’s face. Shot of man holding tube. screen fades to black.