Soviet physician Sergei Brukhonenko developed a primitive heart-lung machine he called an "autojector," and with this device he succeeded in keeping the severed head of a dog alive. He displayed one of his living dog heads in 1928 before an international audience of scientists at the Third Congress of Physiologists of the USSR. To prove that the head lying on the table really was alive, he showed that it reacted to stimuli. Brukhonenko banged a hammer on the table, and the head flinched. He shone light in its eyes, and the eyes blinked. He even fed the head a piece of cheese, which promptly popped out the esophageal tube on the other end.