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Hierarchical category structure of the stimuli. Three category levels are defined: 1) superordinate level: animate vs. inanimate; 2) mid-level (basic level): face vs. body, primate faces vs. nonprimate faces, human body vs. animal body, rhesus face vs. nonrhesus face, and natural inanimate vs. artificial inanimate; 3) subordinate level: human individual identity. Photos courtesy of Hemera Photo-Objects/Jupiterimages.
