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Rodger J. Elble, MD, Phd
Department of Medicine Southern Illinois University School of Medicine 800 N Rutledge Springfield, IL 62708

Arch Neurol. 1982;39(11):737-738.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.—

In their study of normal hand tremor (ARCHIVES 1982;39:358-362), Wade et al describe an 8- to 12-Hz "shoulder" in their hand tremor spectra and suggest that this component is neurogenic, citing my work with Randall.¹ In citing that work, they comment that the 8- to 12-Hz component is somehow related to the recruitment rates of individual motor units. However, Randall and I specifically demonstrated that much more is involved. In particular, motor units firing at mean frequencies of 10 to 22 spikes/s are involved, and, regardless of the mean firing frequency, the firing pattern of each motor unit is modulated at 8 to 12 Hz.¹ The synchronous 8- to 12-Hz modulation of neighboring motor units is then responsible for the 8- to 12-Hz component of hand tremor² and finger tremor.¹ As Wade et al have noted, the amplitude of the 8- to 12-Hz component . . . [Full Text PDF of this Article]

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