空间认识具有四个层次：感觉运动（Sensorimotor）的层次，它以行动的表象为依据；前运算期（Pre-operational）的层次，其基础是从记忆中获得的有关客观世界的知觉的映象-Spatial awareness has four levels: sensorimotor (Sensorimotor) level, which is based on the appearance of action　the former operator of the (Pre-operational) level, based on obtained from the memory of the world' s perception of the objective image