Kohnstamm's phenomenon

• abstract: First described by German neurologist Oskar Kohnstamm (1871–1917) in 1915, Kohnstamm's phenomenon is a sustained involuntary contraction of a muscle after a prolonged voluntary contraction. The simplest demonstration, sometimes called "the floating arms experiment" is to have a subject press the arms against a door frame or wall for about thirty seconds, and then step away.

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