1, egocentrism: think that the world in others' eyes is the same as what he sees, and that the world is centered on him.
2. Irreversibility of thinking: At this stage, children's cognitive activities are relatively specific, and abstract thinking operations cannot be carried out.
3. Rigid thinking: At this stage, students have not yet acquired the concept of conservation of objects.
4. Decentralized characteristics of thinking: When paving the way, we tend to use a standard or dimension, such as: much longer, much denser and much larger.
Junior high school:
1, thinking has certain flexibility: logical thinking and grouping operations can be carried out from the representations obtained from specific things.
2. Reversibility of thinking: thinking begins to be decentralized, and it can handle the relationship between the part and the whole and make some interchangeable logical reasoning.
Reference: Piaget's Theory of Cognitive Development Stages-Baidu Encyclopedia