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. 2012 Feb 2;7(2):e31106. doi: 10.1371/journal.pone.0031106

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(a) Contrast between right and left start positions. All conventions are the same as in Figure 7. Note the symmetrical advantage for the side of face opposite the start position as with upright faces. (b) Contrast between upper and lower start positions. Note, again, the advantage for the side of the face opposite the start position.