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Abstract: This study was designed to examine the hypothesis implied in manyearly temperament theories that the manifestation of emotionality wasconsistent among different emotions. A sample of 30 twelve months oldinfants were measured on some facial expression variables including latencyand duration of four kinds of primary emotions (i. e.happiness,interest,anger, and fear) elicited in an experimental situation. In addition, theheart rate variability (HRV) was also measured during the process ofemotion responses. After using factor analysis method,we did not find any consistency ofemotionality between any two of the four kinds of primary emotions.This result suggested that emotionality should be measured separately forTeach primary emotion. With regard to the HRV,we found a consistencyof emotionality between two positive emotions and between two negativeemotions,but no consistency between positive and negative emotions. Wedid not find any significent correlations between facial expression indexand physiological index.

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