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Diagram of Pavlov's Conditioned Reflex Apparatus

Yerkes, R. M., & Morgulis, S.

A line drawing published by Yerkes and Morgulis showing how Pavlov's famous dog experiment apparatus was built.

This diagram illustrates the physical apparatus used in Pavlov's own conditioned reflex experiments.

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Line drawing of Pavlov's experimental apparatus for conditioned reflex research. A dog is harnessed in a frame on the right, with a tube running to a food dish and a measuring device. On the left is a box with a screen-like panel and a rubber bulb apparatus on a stand. Labeled Fig. 3 at the bottom.
Diagram of Pavlov's conditioned reflex apparatus, published by R. M. Yerkes and S. Morgulis.

About this source

What it is

This is a diagram published by researchers Yerkes and Morgulis explaining the equipment used in Ivan Pavlov's conditioned reflex experiments. It shows a dog harnessed in a frame, connected to a tube leading to a food dish and a measuring device, alongside a box with a screen panel and a bulb apparatus.

Why it matters

This image helps explain, step by step, how Pavlov's laboratory actually tested and measured a dog's salivary response to stimuli. It reveals the careful mechanical setup behind one of psychology's most famous experiments, and shows how other scientists studied and explained Pavlov's methods to a wider audience.

Look closer

  • What parts of the apparatus are designed to control the dog's environment precisely?
  • Why might scientists need such detailed diagrams to repeat or check each other's experiments?
  • What does this diagram not show about how the dog may have experienced the experiment?

This artifact is part of the curated material that grounds the AI version of Ivan Pavlov on Humy.ai — when students ask about related events, the AI can quote it and cite it.

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