FIGURE 4  Archimedean spirals drawn by individuals with and without essential tremor.

From the following article:

Essential tremor: emerging views of a common disorder

Julián Benito-León and Elan D Louis

Nature Clinical Practice Neurology (2006) 2, 666-678
doi:10.1038/ncpneuro0347

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Figure 4.  Archimedean spirals drawn by individuals with and without essential tremor.

(A) A spiral drawn by a patient with severe essential tremor. (B) A spiral drawn by an individual without tremor.

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