Fig. 2: Consistent neural representation of 25 IC axes across hemispheres, individuals and species.

a 25 feature maps of the left temporal lobe for one monkey (M1), plotted on the cortical flat map. Results of all vertices within a 2 mm × 2 mm square were averaged. Each map shows the preference of all locations in the temporal lobe for the positive representative images of one IC axis over the negative ones, with the largest absolute value normalized to 1. In these maps, values close to 1 indicate stronger responses to positive images than to negative images, and values close to -1 indicate the opposite. b Population similarity matrices in two hemispheres. The correlation coefficients between pairs of feature maps were computed as a 25 by 25 matrix. c Correlation coefficients for one hemisphere were compared to those for the other. d Population similarity matrix of a second monkey. e Correlation coefficients for monkey 1 were compared to those for monkey 2. f Consistency of similarity matrices, measured by Pearson correlation, between hemispheres (3 monkeys and 4 humans), individuals (3 monkey pairs and 6 human pairs), and species (3 × 4 monkey-human pairs). For interhemispheric consistency, open and solid dots indicate male and female subjects, respectively. For intersubject consistency, open and solid dots indicate within-gender and between-gender comparisons, respectively. Gray dots indicate upper bounds of 5% confidence interval based on 1000 times of random shuffling. Source data are provided as a Source Data file.