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. 2009 Dec 9;4(12):e8228. doi: 10.1371/journal.pone.0008228

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Wu et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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We used a two-dimensional coordinate system to represent each movement. The coordinate system was embedded in the stimulus array. One axis was parallel to the line connecting the start point and the end point of the movement, and the other, was perpendicular to the first. The origin was centered on the end point of the distribution.

Inline graphic — We used a two-dimensional coordinate system to represent each movement. The coordinate system was embedded in the stimulus array. One axis was parallel to the line connecting the start point and the end point of the movement, and the other, was perpendicular to the first. The origin was centered on the end point of the distribution.