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. 2014 Dec 19;11:170. doi: 10.1186/1743-0003-11-170

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© Heenan et al.; licensee BioMed Central. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Tremor assessment using the spiral drawing task. (A) Power spectra (with low-frequency drift removed) and sample spiral drawings (inset) for Subject 6 with MS (red; TAS = 3) and an age-matched control subject (blue). The shaded area highlights the range of frequencies associated with the subject’s tremor. (B) Maximum power within the 2–5 Hz frequency range for subjects with MS together with their corresponding tremor assessment score (TAS).