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Twelve candidate postures were classified into the following categories based on the two-dimensional theory of emotion: high-arousal negative postures (P1’, 2, and 3’), high-arousal positive postures (P4’, 5, and 6’), low-arousal negative postures (P7, 8, and 9’), and low-arousal positive postures (P10, 11’, and 12). Standing postures are indicated by the prime symbol.
