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. 2017 Nov 1;7:14848. doi: 10.1038/s41598-017-13921-z

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Retinotopic mapping and regions of interest. The figure shows a flattened representation of the posterior portion of the left hemisphere in a representative subject, overlaid with the results from the Retinotopic Experiment (A–C), the Localizer Experiment (D,E) and the resulting regions of interest (F). (A) Eccentricity map. Figure shows color plots of the response to a wide-field ring stimulus expanding at a constant slow speed (about 1°/s). Color hue indicates the response phase, which is proportional to the eccentricity of the local visual field representation. (B) Polar angle map. The color hue indicates the response phase proportional to the polar angle of the local visual field representation. Red, blue, and green areas represent preference for upper, middle, and lower parts of the contralateral visual field, respectively. (C) Map of retinotopic field sign. Analysis of retinotopic data (polar angle and eccentricity) by visual field sign (mirror-image versus non-mirror-image visual field representation). Mirror-image areas (yellow; e.g., V1), and non-mirror-image areas (blue; e.g., V2) are shown. (D) Target-specific regions were localized in each subject by presenting dynamic white noise, during the localizer experiment, in the same position and size of the target (p_FDR < 0.001). The white lines on the surface show the borders between retinotopic visual areas. Specifically, the dotted and solid lines indicate vertical and horizontal meridians, respectively; the enclosed dotted lines indicate V6 and V6Av borders. (E) The visual word form area (VWFA, in the red box), defined in each subject, in the left fusiform gyrus, by the contrast between Latin Vs Devenagari characters (p_FDR < 0.001). (F) The regions of interest, represented in different colors, were restricted to those voxels in the early visual areas that respond to the lower quadrants of the visual field: V1d, V2d, V3, V3A, V7, V6Av, V4/V8, and all the voxels in the VWFA defined by the localizer. Major sulci and gyri (dark gray and light gray respectively) are labeled as follows: intraparietal sulcus, STs (Superior Temporal sulcus); LOR (Lateral Occipital Region); fusiform (fusiform gyrus).