Sex differences in spatial ability Mental rotation is the ability to quickly and accurately rotate a two-dimensional (2D) or three-dimensional (3D) object's spatial orientation in one's imagination (Linn & Petersen, 1985; Voyer, Voyer, & Bryden, 1995). It has been well established that, on average, men perform better than women on mental rotations tasks (Linn & Petersen, 1985; Voyer et al., 1995). Voyer et al. (1995) found that the magnitude of the sex difference in spatial performance was largest on mental rotation tasks, particularly the Vandenberg and Kuse (1978) Mental Rotations Test (MRT), compared to other spatial tasks. The implications of sex differences in mental rotation are widespread. Most notably, performance on spatial tests has been correlated with mathematics achievement (Mix et al.