Figure 6.

Left: Similarity between the topic probability representations of each concept learned solely from text, with concepts grouped by semantic category. Right: Similarity between the topic probability representations predicted from the brain images for each pair of concepts, when they were being used as the test set, for the two best subjects with the highest classification accuracy. These were obtained using a 40 topic model, the general pattern is similar for the other subjects. Note that the representations for concepts in the same category are similar when obtained from brain images and that this is also the case when those representations are derived from text.