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. 2017 Apr 7;7:733. doi: 10.1038/s41598-017-00634-6

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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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Functional delineation of V2 and V3 stripe-based subdivisions. Phase-specified coherence responses displayed on the left (A,C) and right (B,D) inflated cortical surfaces of three subjects (panels A,B: S3, panel C: S1; panel D: S2). The panels in A–D show the enlarged view of the dorsal occipital lobe with the identified V1/V2d/V3d/V3A borders (top insets). The color bar indicates the phase-specified coherence values, indicating responses dominated by “fast” (7.5 Hz) or “slow” (1.5 Hz) temporal frequencies. Only phase-specified coherence values exceeding an absolute value of 15% are shown. The black horizontal line indicates 1 cm in each panel. The coherence and phase-specified coherence across the V1/V2 border is shown in panels E and F respectively. The coherence is a measure for overall response modulation irrespective of the relative response preference. The coherence values are similar across the border indicating a similar overall response to the stimulus (E). The phase-specified coherence also takes into account which temporal frequency drives the response. The phase-specified coherence changes across the V1/V2 border (F) demonstrating a distinct and systematic change in response properties along the V1/V2 border for all four subjects. The error bars reflect standard error of the mean.