Fig 1.
Correlation matrix of the BOLD signal.
Correlation matrix of the BOLD signal time courses for the 26 ICA components. The matrix elements (I, j) represent the Pearson’s coefficient resulting from the cross correlation of the BOLD signal time course between the i and j components. The axes represent each of the component indices, the color scale shows the Pearson’s value. Associated network activity is depicted in Fig 2. Outline box contains the components which most of their correlation were significant (p<0.002 corrected) taken for further analysis.
Fig 2.
Brain networks included in the correlation matrix.
Some of the networks taken from the correlation matrix in Fig 1 (outlined box) based on its order: A) C1, C2, C3 and C5; Dorsal Attention Network (DAN). B) C14; Sensory motor Network (SMN). C) C6; Default Mode Network (DMN). D) C7 posterior cingulate gyrus, lingual gyrus, precuneus. E) C12 Medial frontal gyrus, precuneus, medial temporal gyrus, fusiform gyrus. F) C20 Lingual gyrus, supramarginal gyrus, postcentral gyrus. G) C8 cerebellum anterior right lobe VIII-B area, angular bilateral gyrus.
Fig 3.
BOLD signal components with signitican correlations.
Shown are components with significant correlation (see Fig 1). Average signals (black) obtained from BOLD signals. (group A mean = 0.1060 SD = 2.3151; group B mean = 0.1122 SD = 1.9606) a) Components 12 and 20. b) Components 7, 8, 10 and 14.
Fig 4.
Plots of time signal components average.
Two signal examples. The red line represents the average of component time courses 12 and 20 group A; the blue line of components 7, 8, 10 and 14, group B. The axes indicate the normalized BOLD signal (X) over time (Y).
Fig 5.
Types of scenes corresponding to high BOLD activity.
A) Scenes corresponding to the highest BOLD signal peaks, from group A (C12 and C20 signal); these images are related to the slaughtering actions and are images where the animals are prepared to be hurt. B) Images from group B (C7, C8, C10 and C14 signal) while the animal is hurting (in the dying process). Note that due to copyright reasons, the images showed in this figure are not the actual images used in the study. However, all the images used in this figure represent similar situations observed in the original video. All the images used in this figure were constructed from images acquired and processed in our laboratory.
Fig 6.
Areas with higher correlation.
Areas with higher correlation between subjects during the visualization of the video. Precuneus surface cortex, fusiform gyrus, lateral left occipital areas, lingual gyrus, and posterior cingulate cortex.
Fig 7.
Highest values of cross correlation analyses.
Results from cross correlation analysis showing the highest values for each comparison. For some (DMN-C10, SMN-DAN, DAN-C12, C7-C8) it shows also the next to the highest values. Eight comparisons, from which seven were significant (p<0.0125 corrected), the red lines correspond to the upper and lower confidence bounds.
Fig 8.
Network organization in temporal delay and correlation.
Networks organized based on the temporary delay and correlation (positive or negative) that exist amongst them, according to Fig 7. They are set out in levels according to their activation point in time.