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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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Quantitative assessment of the position sense. Left column (A,D): variability (both axes are in centimeters). Central column (B,E): systematic shift (both axes are in centimeters). Right column (C,F): spatial contraction–expansion (both axes are normalized, adimensional). Top row: comparison between the Intrinsic and Extrinsic-matching modality. Bottom row: comparison between the two sequences of target presentation (random vs. sequence of squares). In all the graphs, the dotted line indicates equal performance in the two compared conditions Brookhart et al. (1984).