I.P. Pavlov with three colleagues operating on a dog in the Physiology Department, Imperial Institute of Experimental Medicine, St Petersburg. Photograph, 1902/1903.

A short black and white film from the Wellcome trust library made in the 1930's of Pavlov's experiments demonstrating conditioned and unconditioned responses in humans and animals.

The Wellcome trust catalogue describes the film as:

This black and white, silent film, attempts to show the difference between conditioned and unconditioned responses in animals and humans. It begins by enacting Pavlov's experiments on a dog's salivary mechanism. Gradually we are shown how the unconditioned production of saliva at the sight or smell of food can be conditioned to appear at the sight of a flashing light. We also examine a newborn baby's reflexes of sucking and grabbing and see how they become conditioned as it grows older. Simple animated diagrams attempt to explain changes in the brain as a subject becomes conditioned. Professor Krasnagorski enacts a salivary test on a young boy in his laboratory. Attention is paid to the difference between instinctive behaviour in animals and learned behaviour. This is illustrated by images of animals in the wild and those in zoos. We see trained seals performing tricks for rewards and Prof. Gladishikov demonstrating 'the pain method of training' on lions and bears. 6 segments. 

Link to Pavlov film

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