Training improves the ability of human observers to discriminate between two similar directions of motion. This gradual improvement is specific to the direction on which an observer is trained, enduring for several months. Improvement does not affect motion perception generally, nor does it depend on recognition of details of the movement. (Author)

Reports on a study in which the symbolic relation between a scale model and the larger space that it represents was displayed by two groups of young children. Three-year-old children outperformed 2.5-year-olds in finding an object in a room after seeing an analogous object hidden in a model. (TW)