One might further speculate about the question of how motor activity could facilitate imagery performance
considering another special feature of our task. Unlike most other imagery tasks, which require
a rigid transformation of either an object or a frame of reference, the current task requires
coordinating two pieces of information: the movement of the water and the movement of the container.
Therefore, motor activity might help children to coordinate these two movements, for example,
by taking advantage of already prewired mechanisms of eye–hand coordination (von Hofsten &
Rönnqvist, 1988). Furthermore, motor activity might divide the workload between the visual and motor
systems by outsourcing one part of the simulation to the hand. However, these ideas are speculative
so far, and further research is needed to explain the mechanisms behind the effects of motor
activity on mental imagery.