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 is to have a subject press against the wall by abducting the arm and then ask to step away from the wall. The arm will involuntarily rise.

Russian scientists [http://www.ras.ru/win/db/show_per.asp?P=.id-1047.ln-ru Victor Gurfinkel] , [http://geocities.com/mikhail_a_lebedev/ 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

References

* Kohnstamm, O. Demonstration einer Katatonieartigen Erscheimung beim Gesunden (Katatonusversuch). Neurol. Zentral B1 34S: 290-291, 1915.
* Gurfinkel, V.S., Lebedev, M.A., Levick, Yu.S. (1992) What about the so-called neck reflexes in humans? In: A. Bertoz, W. Graf, P. P. Vidal (Eds) [http://www.oup.com/us/catalog/general/subject/LifeSciences/VertebrateZoology/~~/cHI9MTAmcGY9MCZzcz1hdXRob3IuYXNjJnNmPWFsbCZzZD1hc2Mmdmlldz11c2EmY2k9MDE5NTA2ODIwMw= The Head-Neck Sensory Motor System] , New York, Oxford, Oxford University Press: 543-547.
* Gurfinkel, V.S., Levik, Yu.S., Lebedev, M.A. (1989) [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=2770916&query_hl=4 Immediate and remote postactivation effects in the human motor system.] Neirofiziologiya (Kiev) 21: 343-351. Translation into English: Neurophysiology 21: 247-253.
* Gurfinkel, V.S., Levik, Yu.S., Lebedev, M.A. (1989) [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=2752900&query_hl=4 Postural automatisms revealed by enhancement of the tonic background.] Doklady Akademii Nauk SSSR 305:1266-1269.
* Duclos C, Cerebral correlates of the “Kohnstamm phenomenon”: An fMRI study, NeuroImage Vol 34, Issue 2, 15 January 2007, Pages 774-783
* Wright WG, Interaction of involuntary post-contraction activity with locomotor movements, Exp Brain Res. 2006 Feb 169(2): 255–260
* Mathis J, Facilitation of motor evoked potentials by postcontraction response (Kohnstamm phenomenon), Electroencephalogr Clin Neurophysiol. 1996 Aug


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Kohnstamm — may refer to:* Thomas Kohnstamm, American writer * Kohnstamm s phenomenon*Philip Kohnstamm (1875 1951), natural scientist, philosopher and educator, of Jewish origin *Max Kohnstamm (1914), diplomat and historian, son of Philip; see Four Freedoms… …   Wikipedia

  • Kohnstamm-Effekt — Der Kohnstamm Effekt (oder das Kohnstamm Phänomen) beschreibt eine unwillkürliche Anspannung der Muskulatur nach vorheriger intensiver Muskelanspannung. Der Begriff geht auf den deutschen Neurologen und Psychiater Oskar Kohnstamm (1871–1917)… …   Deutsch Wikipedia

  • Kohnstamm phenomenon — Kohn·stamm phenomenon (kōnґshtahm) [Oskar Felix Kohnstamm, German physician, 1871–1917] aftermovement …   Medical dictionary

  • Kohnstamm — Oskar, German physician, 1871–1917. See K. phenomenon …   Medical dictionary

  • phenomenon — 1. A symptom; an occurrence of any sort, whether ordinary or extraordinary, in relation to a disease. 2. Any unusual fact or occurrence. [G. phainomenon, fr. phaino, to cause to appear] adhesion p. a p. manifested by the adherence of antigen… …   Medical dictionary

  • Kohnstamm phenomenon — aftermovement …   Medical dictionary

  • Oskar Kohnstamm — 1915,Graphics by Ernst Ludwig Kirchner Dr. Oskar Felix Kohnstamm (13 April 1871 in Pfungstadt 6 November 1917 in Frankfurt am Main) was a German neurologist and psychiatrist. Initially trained in internal medicine in Giessen and Strassbourg he… …   Wikipedia

  • Human position — Pose redirects here. For other uses, see Pose (disambiguation). Human position refers to a position of a human body.There are several synonyms that refer to the human position, often used interchangeably, but having specific flavors. [ [ position …   Wikipedia

  • aftermovement — Involuntary arm abduction that follows sustained isometric contraction of the deltoid and supraspinatus muscles (usually performed by pushing the upper extremity forcibly and against an immovable vertical surface while standing closely beside it) …   Medical dictionary


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.