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Kohnstamm's phenomenon : ウィキペディア英語版
Kohnstamm's phenomenon
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. The arm will involuntarily rise.
Russian scientists (Victor Gurfinkel ), ( Mikhail Lebedev ) and Yuri Levick used Kohnstamm's phenomenon to activate tonogenic structures in humans and thereby demonstrate postural automatisms, such as neck reflexes.
== See also ==

* Motor control

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