Spatial visualization ability or visual-spatial ability is the ability to mentally manipulate 2-dimensional, 3-dimensional and 4-dimensional figures. It is typically measured with simple cognitive tests and is predictive of user performance with some kinds of user interfaces.
The cognitive tests used to measure spatial visualization ability include mental rotation tasks like the Mental Rotations Test and cognitive tests like the VZ-1 (Form Board), VZ-2 (Paper Folding), and VZ-3 (Surface Development) tests from the Kit of Factor-Reference cognitive tests produced by Educational Testing Service. Though the descriptions of spatial visualization and mental rotation sound similar, mental rotation is a particular task that can be accomplished using spatial visualization.
The Form Board test involves giving participants a shape and a set of smaller shapes which they are then instructed to determine which combination of small shapes will fill the larger shape completely without overlapping. The Paper Folding test involves showing participants a sequence of folds in a piece of paper, through which a set of holes is then punched. The participants must choose which of a set of unfolded papers with holes corresponds to the one they have just seen.
The Surface Development test involves giving participants a flat shape with numbered sides and a three-dimensional shape with lettered sides and asking the participants to indicate which numbered side corresponds to which lettered side.
According to certain studies, men on average have one standard deviation higher spatial intelligence quotient than women. This domain is one of the few where clear sex differences in cognition appear. However, in a couple of studies, once time constraints were removed, women did as well as men. It has also been found that spatial ability correlates with verbal ability in women but not in men, suggesting that women may use different strategies for spatial visualization tasks than men do. Researchers at the University of Toronto state they have shown that differences between men and women on some tasks that require spatial skills are largely eliminated after both groups play a video game for only a few hours. Although some have claimed women are more "visually dependent" than men, this has recently been disputed. Other studies suggest gender differences in spatial thinking may be explained by a stereotype threat effect. The fear of fulfilling stereotypes negatively affects the performance which results in a self-fulfilling prophecy. The adaptive significance, if any, of male superiority in spatial navigation, has recently been questioned.