J. Pfahl. Graphic depiction of motor processes, especially with knee reflexes. Ueber dié graphische Darstellung von Bewegungsvorgängen, ins besonderen des Patellarreflexes. Zeitschr. für d. ges. Neurol. und Psychiatrie. Bd. I, s. 502 (1910).

Abstract

Pfahl notes that when accurately studying the pattelar reflex using graphic curves, one should bear in mind the fact that when studying this reflex in a sitting position, it is necessary to take into account not only the effect of muscle contraction, the phenomenon of a reflex nature, but also to reckon with the influence of gravity, grounding the extensor movements of the leg. and accelerating flexion.

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