Figure 2
Semantic space of odors. (a) (i) Three-dimensional representation of odors in the semantic space as a function of pleasantness, intensity, edibility and familiarity; (ii) correlation coefficients between the first four principal components of the PCA (PC1 to PC4) and each of the four olfactory perceptual dimensions (pleasantness, intensity, edibility, familiarity). (iii) Distribution of individual absolute values of coefficient correlations (r) between the four olfactory perceptual dimensions and the first principal component of the semantic space. (b) (i) Three-dimensional representation of odors in the semantic space as a function of pain, irritation, coolness and warmth; (ii) correlation coefficients between the first four principal components of the PCA and each of the 4 trigeminal dimensions of pain, irritation, coolness and warmth). (iii) Distribution of individual absolute values of coefficient correlations (r) between the four trigeminal dimensions and the first principal component of the semantic space. In a.i and b.i, color scale codes for each of the eight perceptual ratings: ranges from 0 (blue) to 1 (red). (*p < 0.05, **p < 0.01, ***p < 0.001).
