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The uppermost trace shows inflation pressure, the lower traces contractions of the diaphragm slip. A, the Breuer-Hering inflation reflex, showing relaxation of the diaphragm. B, Head's paradoxical reflex, showing contraction of the slip, when the vagi were recovering from cold block. Reproduced from Cross KW, Head's paradoxical reflex, Brain 84, 529–534, by permission of Oxford University Press.
