D. Freedman, “Categorical Representation of Visual Stimuli in the Primate Prefrontal Cortex,” Sci 291 (2001): 312. Еще примеры кодировки разных категорий: D. McNamee et al., “Category-Dependent and Category-Independent Goal-Value Codes in Human Ventromedial Prefrontal Cortex,” Nat Nsci 16 (2013): 479. R. Schmidt et al., “Canceling Actions Involves a Race Between Basal Ganglia Pathways,” Nat Nsci 16 (2013): 1118.