Ivan Petrovich Pavlov students your University nationals ras Sierra Experimental study of dog saliva secretion putting, when you hear a chime sound by tested by feeding dogs. When you remove the meat, put the dogs mouth powder. The dog is drooling. Later, she heard the Bell trial, and then to feed the dog. By repeated trials in dogs drooling when I hear a chime sound alone, because learning occurs, and the link between a chime sound with food.
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