John Dewey
In the 20th century, John Dewey (1894: 558–559) had a similar version of the Relief Theory. Laughter, he said, “marks the ending … of a period of suspense, or expectation.” It is a “sudden relaxation of strain, so far as occurring through the medium of the breathing and vocal apparatus… The laugh is thus a phenomenon of the same general kind as the sigh of relief.”
via https://plato.stanford.edu/entries/humor/#RelThe
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