Questions: Centration and Decentration in Cognitive Development

Question 1

In a conservation-of-liquid task, a child watches water poured from a short, wide glass into a tall, thin glass. The child says the tall glass has more water. Which explanation best captures the cognitive process at work?

• A. The child is lying to please the experimenter
• B. The child centrates on height, ignoring that the same volume was poured
• C. The child correctly identifies that taller containers hold more
• D. The child lacks the vocabulary to express that volume is conserved

Answer: (B)

This is centration in action. The tall glass looks more prominent — height is the salient perceptual feature — so the child's attention locks onto it while ignoring the transformation (same water was poured) and the competing dimension (width decreased). The child is not lying or confused about words; they genuinely perceive the tall glass as having more, because their cognition cannot simultaneously process height and width to integrate them.

Question 2

A teacher observes that a 7-year-old can correctly conserve number (two spread-out rows have the same count) but still fails conservation of weight tasks. What does this pattern illustrate?

• A. The child has not yet entered the preoperational stage
• B. Conservation tasks are unreliable measures of cognitive development
• C. Decentration develops unevenly across domains — horizontal décalage
• D. The child's failure on weight tasks proves centration is permanent

Answer: (C)

This is precisely horizontal décalage — the finding that decentration spreads gradually across domains rather than developing all at once. The child has achieved decentration in the number domain but not yet in the weight domain. This shows that cognitive stage transitions are not light switches; they are spreading capacities that consolidate domain by domain. It does not mean the child is stuck — it means decentration for weight will come later.

Question 3

Decentration is the cognitive ability that allows children to pass conservation tasks.

• T. True
• F. False

Answer: True

Conservation tasks require the child to track multiple dimensions simultaneously — for example, both height and width of liquid, or both spacing and number of objects. Centration causes failure because the child focuses on one dimension (the one that changed visually) and ignores the other. Decentration — the capacity to hold multiple attributes in mind at once — is precisely what allows the child to integrate all relevant information and reason correctly that the quantity is unchanged.

Question 4

Once a child demonstrates decentration, they will apply it uniformly across most types of conservation and classification tasks.

• T. True
• F. False

Answer: False

This is the misconception of horizontal décalage. Decentration develops unevenly: a child may show it on number tasks before liquid, on liquid before weight, on weight before volume. The same child can centrate in one domain and decentrate in another simultaneously. Treating decentration as a binary, domain-general achievement misrepresents how cognitive development actually unfolds.

Question 5

Explain why centration causes a preoperational child to fail conservation tasks, even when they watched the transformation happen right in front of them.

Model answer: Centration means the child's attention locks onto the most perceptually salient feature of the current state — height, length, or spread — while ignoring both the transformation and the competing dimensions. They see the tall glass or the spread-out row as it appears now, without mentally tracking the process that produced it or integrating multiple attributes. Conservation requires holding multiple dimensions simultaneously (e.g., height AND width) and tracking that the transformation didn't add or remove quantity. Centration prevents both, so the child responds to how things look rather than what was actually done to them.

The key is that centration is not ignorance or carelessness — it is a genuine cognitive constraint on how attention is distributed. The child is doing their best reasoning with the information they can hold simultaneously. Preoperational thought is perceptually dominated: what the current state looks like overrides the memory of what was done. Decentration resolves this by allowing the child to track both the transformation and multiple dimensions at once, which is what conservation reasoning requires.