Figure 6.

Dendrogram obtained by cluster analysis of the population of associative-pair-responsive neurons in the AITv area. A, The 20 faces (4 identities by 5 views) and four abstract patterns used in the APA task as visual stimuli. A picture number was assigned for each visual stimulus. The four paired associates are indicated by different colors. B, The dendrogram depicts the dissimilarity/similarity relationships of all visual stimuli used in the cognitive task comprised of 20 faces (4 identities by 5 views) and four abstract patterns, as obtained by a cluster analysis. In the cluster analysis, the dissimilarity of all possible stimuli pairs, as defined based on correlation coefficients between the magnitudes of cue response to each stimuli in the pair, was used for all of the associative-pair-responsive neurons recorded in the AITv (n = 80).