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Intact hemisphere and corpus callosum compensate for visuomotor functions after early visual cortex damage

  1. Marco Tamiettoa,b,d,1
  1. aDepartment of Psychology, University of Torino, 10123 Torino, Italy;
  2. bDepartment of Medical and Clinical Psychology, Tilburg University, 5000LE Tilburg, The Netherlands;
  3. cDepartment of Cognitive Neuroscience, Maastricht University, 6229ER Maastricht, The Netherlands;
  4. dDepartment of Experimental Psychology, University of Oxford, OX1 3UD Oxford, United Kingdom;
  5. eDepartment of Neuroscience, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy;
  6. fNational Institute of Neuroscience, 37134 Verona, Italy
  1. Contributed by Lawrence Weiskrantz, October 12, 2017 (sent for review August 21, 2017; reviewed by Melvyn A. Goodale and Juha Silvanto)

  1. Fig. 2.

    Brain activity during conscious and nonconscious perception. The areas are significantly activated for each specified contrast at P < 0.05 corrected for FDR. Areas colored from red to yellow are significantly more active for crossed vs. uncrossed conditions during conscious perception (Upper), for nonconscious perception irrespective of response hand (Middle), and for the crossed vs. uncrossed conditions during nonconscious perception (Lower). The opposite holds for areas colored from blue to green. The lesion in the left V1 of G.Y. is visible and represented in dark red.

  2. Fig. 3.

    Correlations in fMRI percent signal change during nonconscious perception. All possible correlations between left (L-) and right (R-) IPS and left and right premotor cortex (PM) as a function of crossed and uncrossed response conditions are displayed in the central transparent brain. The four areas are symbolized by spheres of different colors for the crossed (red) and uncrossed (blue) conditions. Edges diameter represents Pearson r value, whereas edges color represents P value. Nonsignificant correlations are shown in transparent gray. Lateral insets report scatterplots for the eight most relevant correlations. Marginal curves show the distribution of the data along X and Y axes, internal lines represent fitted correlations, and gray areas show 95% confidence limits.

  3. Fig. 4.

    Connectional, topographic, and microstructural properties of the CC. (A) Circular representation of the connectional fingerprint associated with cortical areas coactivated with the CC. Segments represent different areas and ribbons fiber tracts. Connections between areas in opposite hemispheres that did not course through the activated clusters in the CC are not displayed. (B) Tractographic segmentation of callosal fibers based on cortical projections in patient G.Y. and one representative control. Color codes for the seven callosal subregions are the same as those reported in the legends of C and D. (C) Three-dimensional representation of the CoG for each callosal compartment in the control subjects (circles) and G.Y. (squares). (D) Fiber counts for each callosal sector in the controls and G.Y. Box represents 25th and 75th percentiles, internal line represents controls mean, and whiskers represent SD. AF, anterior frontal; OCC, occipital; OF, orbitofrontal; PP, posterior parietal; SF, superior frontal; SP superior parietal; TP, temporal.

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