Different slopes for different folks: Process analysis of spatial aptitude

Adults differing in spatial ability were tested on problems involving the mental rotation of familiar alphanumeric stimuli and unfamiliar stimuli drawn from the Primary Mental Abilities Space Test. Individual differences in spatial ability were associated with speed rather than accuracy of mental rotation processes. Ability differences were correlated with the time to rotate familiar alphanumerics and the additional time to encode, compare, and rotate unfamiliar stimuli. The results are discussed in terms of differences in elementary information processes associated with the representation and transformation of visual information.