Cognitive Development in Early Childhood

All 7 Terms & Definitions

Preoperational stage (Piaget)

Piaget's second cognitive stage, spanning approximately ages 2–7. Symbolic thought is present — language, pretend play, drawing — but logical operations are absent. Characteristic limitations include egocentrism, centration, irreversibility (inability to mentally reverse operations), and animism (attributing life to inanimate objects). The preoperational child cannot conserve quantity, number, mass, or volume.

Egocentrism (preoperational)

The inability to take another person's cognitive or spatial perspective — not self-centredness, but a cognitive limitation. Illustrated by Piaget's three mountains task: children assume another person sees what they see. Donaldson's contextualised replication (the "policeman" version) showed children succeed when the social context is meaningful, suggesting the limitation is partly task-specific.

Conservation failures

The preoperational child's inability to understand that quantity, number, mass, or volume remains constant despite changes in perceptual appearance. Classic task: two equal glasses of water, one poured into a taller thinner glass — the child judges the taller glass has more. Conservation of number is typically mastered around age 6–7; conservation of mass (5–7 years) and volume (9–11 years) follow.

Theory of Mind

The capacity to attribute mental states — beliefs, desires, intentions, emotions — to oneself and others, and to understand that mental states causally influence behaviour. A key indicator is passing the false belief task: understanding that another person can hold a belief that the child knows is false. Typically achieved around age 4; earlier in children with rich sibling environments and more advanced language.

False belief task

The canonical measure of theory of mind. In the Wimmer & Perner (1983) paradigm ("Maxi task"), a character places chocolate in one location, then leaves; the chocolate is moved; the child must predict where the character will look. In Baron-Cohen's Sally-Anne task, the child must say where Sally will look for a marble she believes is in her basket (it has been moved). Children under 4 typically fail, predicting the character will look where the object really is.

Private speech (Vygotsky)

The self-directed, audible speech children produce when working on tasks — narrating actions, talking through problems. Vygotsky saw this as social speech being internalised into thought. It peaks during the preschool years on difficult tasks and fades as competence develops. Berk (1986) confirmed it is most frequent at intermediate challenge, supporting the internalisation account over Piaget's egocentric speech interpretation.

Scaffolding and the ZPD in early childhood

Early childhood is the canonical context for Vygotskian scaffolding: the zone of proximal development is wide, the child is highly motivated by play and social interaction, and the effects of skilled support are large. Scaffolded jigsaw puzzles, shared book reading, and guided play are empirically supported contexts for cognitive development in this period.