Abstract: Egocentric perspective transformation is associated with the process of spatial transformation which depends on egocentric reference system. Previous studies showed that egocentric perspective transformation has a viewer advantage over object-based transformation. Further evidence from neuropsychological studies indicate a dissociation between these two types of transformation on neural basis. These findings support the multiple-system models hypothesis suggesting mechanisms and properties of egocentric perspective transformation are independent. Researches on egocentric perspective transformation have both theoretical and practical significance.

Key words: mental spatial transformation, egocentric perspective transformation, object-based spatial transformation, double-dissociation model