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. 2013 Dec 26;8(12):e82756. doi: 10.1371/journal.pone.0082756

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© 2013 Helmchen 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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The subject’s view on the real-time video displays in the eight different experimental conditions is shown. As in the mirror experiment, the injection site is masked by red color patches at homologue skin sides on both forearms to prevent visual identification of the itching forearm.

Scratching side is indicated by [S-] at the non-itching (left) forearm and by [S+], at the itching (right) forearm. The visual percept that scratching is applied to the non-itching (left) forearm only is indicated [V-/+]; to the itching (right) forearm only [V+/-], to both forearms [V+/+], or visual percept that no scratching is applied [V-/-] (see also Table 1). In the case of two visible forearms, one forearm is flipped (mirrored), the other is visible at it is normally seen.