Perception of Complex Geometric Figures in Chimpanzees (Pan troglodytes) and Humans (Homo sapiens): Analyses of Visual Similarity on the Basis of Choice Reaction Time

In a conditional-discrimination task (matching-to-sample), assessed similarities among figures consisting of 2 elemental figures through the choice reaction time (RT), nonmetric multidimensional scaling, and hierarchical cluster analysis of data from chimpanzees (Pan troglodytes) and humans (Homo sapiens). Humans also rated similarities among figures. The results of the 3 experiments clearly indicated that the RT data […]