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3.4 Cognitive Development Across the Lifespan

Syllabus
2025
Topic
3.4
Level
—

Learning objectives

3.4A—Explain how theories of cognitive development apply to behavior and mental processes. UNIT 3 Development and…Explain how theories of cognitive development apply to behavior and mental processes. UNIT 3 Development and Learning• According to Piaget, children develop schemas via continuous and discontinuous processes such as assimilation and accommodation.- i. The sensorimotor stage occurs from infancy through toddlerhood. Object permanence develops during this stage.- ii. The preoperational stage occurs from toddlerhood through early childhood. Children become proficient in using mental symbols and engage in pretend play. The preoperational stage is identified more by cognitive tasks children cannot perform such as conservation and reversibility, or by those they exhibit, such as animism and egocentrism. Children begin to develop a theory of mind during this stage.- iii. The concrete operational stage occurs from early through late childhood. Children in this stage can generally correct the cognitive errors made in the preoperational stage and understand the world in logical, realistic, and straightforward ways, but struggle to think systematically.- iv. The formal operational stage occurs from late childhood through adulthood. People in this stage gain the ability to think abstractly and hypothetically. Piaget proposed that not all people achieve formal operational thinking.• According to Vygotsky, children are social learners who learn through interacting with and scaffolding by other people within sociocultural contexts. Ideally, learning occurs while the person is in their zone of proximal development.• Adults experience changes in cognitive capabilities as they progress through the lifespan. Crystallized intelligence remains relatively stable through adulthood while fluid intelligence tends to wane as people age. Cognitive disorders that affect adults include dementia.

How Thinking Develops Across the Lifespan

Piaget proposed that children build schemas—mental frameworks for organizing experience. Assimilation fits new experience into an existing schema; accommodation changes a schema when the experience does not fit. These continuous adjustments occur alongside discontinuous stage changes in the kind of thinking a child can use.

Piagetian stage Lifespan period Characteristic thinking or behavior
Sensorimotor Infancy through toddlerhood Object permanence develops
Preoperational Toddlerhood through early childhood Mental symbols and pretend play develop; conservation and reversibility are difficult; animism and egocentrism occur; theory of mind begins developing
Concrete operational Early through late childhood Logical, realistic thinking corrects many earlier errors, but systematic thinking remains difficult
Formal operational Late childhood through adulthood Abstract and hypothetical thinking becomes possible, although Piaget proposed that not everyone achieves it

A child who understands that quantity remains the same after its appearance changes demonstrates conservation and therefore thinking beyond the characteristic preoperational limitation. The behavior is evidence used to infer a cognitive process; age alone does not prove the stage.

Vygotsky emphasized social learning within a sociocultural context. A learner's zone of proximal development contains tasks not yet completed independently but achievable with suitable help. Scaffolding is that temporary support: another person guides performance and adjusts assistance as competence develops.

Cognitive capabilities do not all follow one adult trajectory. Crystallized intelligence—accumulated knowledge—remains relatively stable through adulthood, while fluid intelligence—the capacity to solve new problems—tends to wane with age. Dementia is a cognitive disorder affecting adults; it should not be treated as the normal meaning of every age-related cognitive change.

Do not collapse the accounts into one claim. Piaget emphasizes changing cognitive structures and stages; Vygotsky emphasizes supported learning in social context; adult lifespan evidence distinguishes different cognitive capabilities rather than describing a uniform decline.