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. 2014 Sep 29;8:119. doi: 10.3389/fncir.2014.00119

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Copyright © 2014 Rosa Salva, Sovrano and Vallortigara.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and 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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Examples of the stimuli employed by Sovrano et al. (in preparation; Sovrano, 2014) in Xenotoca eiseni, to investigate the Müller-Lyer illusion, in which a line with two arrow-shaped inducers at its ends facing outwards (A) appears longer than an identical one with inducers at its ends facing inwards (B). In a control condition (upper part of this figure) the line is of a different color than the inducers (the line is red while the inducers are still black). In this condition the line was red also during training.