Fig. 7: Comparison of feature preferences between the two primate species.
From: High-dimensional topographic organization of visual features in the primate temporal lobe
a PCA was performed on the preferred features of all subjects pooled together. To balance the contributions of the two species, the human data (blue) were down-sampled to the size of the monkey data (red). Only 40% of all data points are plotted to avoid overcrowding. Marginal distributions of the full data set are shown. b Cosine angles between preferred features of the animate/inanimate regions in the two species and three features, including: “animacy” feature, “high sf” feature, and sum of the two. Feature preferences of all squares were projected onto the “animacy” feature, and squares with top/bottom 15% projections were defined as the animate/inanimate region. Box plots show the median (line), quartiles (boxes), range (whiskers), and outliers (circles); n = 498 and 2041 brain locations from 3 monkeys and 4 human subjects, respectively. c Positive and negative representative images of the combined feature (animacy+high sf). Note that the original ImageNet images are replaced with natural images from Pixabay (https://pixabay.com/). d Normalized fMRI responses of the inanimate region to the two conditions for one monkey and one human subject (see Methods). Box plots show the median (line), quartiles (boxes), range (whiskers), and outliers (circles). The results from multiple scans for the two conditions were compared using a paired t-test (two-tailed, p = 2 × 10−6, t(10) = 9.52, n = 11 scans for monkey M1, p = 2 × 10−4, t(11) = −5.59, n = 12 scans for human subject H1). Since in this experiment we recruited human subjects who were not characterized for the 25D feature map, the inanimate regions were determined as the 15% squares with the largest t-contrasts between inanimate and animate blocks of the four-object-type stimuli (Fig. 6a). The average response time courses to two stimulus conditions are shown in the insets. Horizontal bars indicate stimulus duration ( = 24 s). Vertical bars represent a 1% change in fMRI signal. e Comparison of the preference for positive over negative representative images between human and monkey inanimate regions. Each dot represents one individual. p = 4 × 10−4 between the two groups (Student’s t-test, two-tailed; t(9) = 5.42, n = 3 monkeys and 8 human subjects). Open and solid red dots indicate male and female subjects, respectively. Source data are provided as a Source Data file.
