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Book IX - Geometrical—trigonometrical clue

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Chapter Summary

Pierre Rondot, one of Garcin?s pupils, brought a new approach to the study of the relationship between posture, movement and muscle tone. One of Rondot?s original contributions in this field was to perform his electromyographic observations after mirroring and in combination with simultaneous recording of the Westphal reaction?a phenomenon first described in 1877 by Carl Friedrich Otto Westphal, widely known in German neurology thanks to the favourable attention paid to it by Westphal?s mentor at Heidelberg Prof. Wilhelm Heinrich Erb. Rondot? electromyographic measurements allowed him to conclude that there are mechanisms, invisible to the eye of the observer, which act to ensure the precision of any movement before, during and after the movement in question. Using this technique to examine a number of clinical conditions such as Parkinson?s disease, dystonia, athetosis and experimental decerebrate rigidity as described by Sherrington (1910, 1915),13 he made a number of new observations.

Keywords: athetosis; decerebrate rigidity; dystonia; electromyographic observations; Garcin?s pupils; Geometrica; Parkinson?s disease; Pierre Rondot; trigonometrical clue; Westphal reaction



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