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. 2014 Dec 10;5:1431. doi: 10.3389/fpsyg.2014.01431

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Copyright © 2014 Serrano-Pedraza, Romero-Ferreiro, Read, Diéguez-Risco, Bagney, Caballero-González, Rodríguez-Torresano and Rodriguez-Jimenez.

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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Contrast detection thresholds as a function of age (years) for the three conditions (No-Surround, Orthogonal Surround, and Parallel Surround). Blue squares, contrast detection thresholds for patients; red circles, contrast detection thresholds for control group. The blue horizontal line represents the mean ± SEM for patients; the red horizontal line represents the mean ± SEM for the control group. p-values are the same as in Figure 2. Asterisks (*) correspond to significant differences between the means of the contrast detection thresholds.