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Full Idea
One could train a dog to bark only when a bell rang and a light shone without presupposing that it possessed the concept of conjunction.
Gist of Idea
You can't infer a dog's abstract concepts from its behaviour
Source
Michael Dummett (Truth [1959], p.235)
Book Ref
'The Nature of Truth', ed/tr. Lynch, Michael P. [MIT 2001], p.235