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. 2021 Jan 8;4:54. doi: 10.1038/s42003-020-01571-3

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© The Author(s) 2021

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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Fig. 5 — a The location of each seed is shown in a typical example of a hemisphere displaying a PCGS (CHIMP_C – LH). The location of each region of interest (ROI) is shown on the cortical surface of the same hemisphere. The heat-map represents the averaged seed-ROI Z values in hemispheres displaying a PCGS. Boxplots displaying the mean ± SD Z-transformed connectivity between each seed (areas 24c′ and 32′) with the various ROIs in hemispheres displaying a PCGS. Results show that the correlation strength between Area 24c′ and Area 32′ with the prefrontal cortex is significantly higher than with the motor zones (Area 24c′: df = 7, F = 154.8, p < 2.2e−16; Area 32′: df = 7, F = 157, p < 2.2e−16, ANOVA). b The location of each seed is shown in a typical example of a hemisphere displaying no PCGS (CHIMP_B – LH). The heat-map represents the averaged seed-ROI Z values in hemispheres displaying a PCGS. Boxplots displaying the mean ± SD Z-transformed connectivity between each seed (areas 24c′ and 32′) with the various ROIs in hemispheres displaying no PCGS. Results show that the correlation strength between Area 24c’ and Area 32′ with the prefrontal areas is significantly higher than with the motor zones (Area 24c′: df = 7, F = 123.5, p < 2.2e−16; Area 32’: df = 7, F = 110.1, p < 2.2e−16, ANOVA). c Significant negative linear trend of connectivity (slope) of each seed with the rostral-caudal position of lateral frontal ROIs (ROIlines) in hemispheres displaying or not a PCGS. The ROIline was obtained by recoding the ROIs in terms of their relative rostro-caudal rank: 1, Area 10; 2, DLPFC; 3, Area 45; 4, Area 44; 5, Fo; 6, FEF; 7, M1Face; 8, M1Hand. Results show that these negative slopes were statistically similar for both seeds (Area 24c′ and Area 32′) and for both morphologies (presence or absence of a PCGS) (interaction between seed identity, seed location, and ROIline, F = 3.03, p > 0.05, ns, 3-ways ANOVA). LH left hemisphere; *** statistically significant at p < 0.001.