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. 2015 Feb 18;9:72. doi: 10.3389/fnhum.2015.00072

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Copyright © 2015 Iandolo, Squeri, De Santis, Giannoni, Morasso and Casadio.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The top row displays the overall matching error (ME: mean ± SE over all subjects) along the y-coordinate (A) and the x-coordinate of the workspace (B). The middle row displays the rightward–leftward component of ME, i.e., ME_x along the y-coordinate (C) and the x-coordinate (D). The bottom row displays the upward–downward component of ME, i.e., ME_y along the y-coordinate (E) and the x-coordinate (F). The x-coordinate of the workspace goes from left to right, with a range of ±10.5 cm and the y-coordinate of the workspace goes from close to far, with a range of ±10.5 cm. Intrinsic-matching test: gray lines; Extrinsic-matching test: black lines. The empty markers correspond to the targets on the midline (0 cm) of the workspace or near to it (±3.5 cm).