Recent research of Prof. Maria Kozhevnikov (Department of Psychology, George Mason University, VA) has shown that there are two distinct abilities: mental rotation (an ability to imagine rotation of objects from a fixed perspective) and perspective taking (an ability to imagine a reoriented-self) [pdf]. The second skill (perspective-taking) is the skill, which is important for navigating in space.
Up until now, the existing tests did not dissociate successfully between mental rotation and perspective-taking abilities, since most existing tests could be solved by using mental rotation as well as perspective taking strategy. As a result, all the existing commercially-available spatial tests measure mostly mental rotation ability (e.g., the ability to imagine rotating objects from a fixed perspective), which is a different ability not related to navigational skills.
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