When participants tilted the glasses by means of a remote control, we found a significant age trend
of increasing use of glass diameter as a relevant factor with increasing age. This result provides converging
evidence that the younger the children, the more they rely on motor information and active
execution of movements to maintain and control mental images. These results are in line with recent
studies showing that young children’s mental rotation performance was influenced more by concurrent
motor activities than was older children’s performance (Frick et al., in press; Funk et al., 2005).