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Layoff, 1890. Artist: Ivan PavlovLayoff, 1890. Bogdanov, Ivan Petrovich (1855-1932). Found in the collection of the State Tretyakov Gallery, Moscow
Diagram of Pavlovs findings on conditioned salivary reflex. D: organ of touch and temperature; N: 1-6 analysers; S: salivary gland; Q: saliva secreting centre in the medulla oblongata; M: muscle; R