Abstract :
Summary form only given. How do infants acquire the ability to manipulate another´s attention, and become able to direct others´ attention toward the object which they were interested in? For infants who can´t use language, the most useful tool to attract others´ attention is their expressive eyes. Thus, the primary style of attracting others´ attention was considered to begin as an infant´s gaze shifts from an interesting object to their social partner. Previous studies pointed out the possibility that infant gaze shift from the object to person would be increased by arousal of emotion (Adamson & Russell, 1999). However, this idea hasn´t yet been verified. Therefore, the main purposes of this study were to investigate whether arousal of positive emotion would trigger an infant´s gaze shift from an object to a person, and to clarify the developmental changes of infant gaze shift
