Developmental Psychology Vocabulary in English

Jean Piaget proposed that children develop cognitive abilities through four universal stages: sensorimotor (birth to 2 years, learning through senses and actions), preoperational (2 to 7 years, symbolic thinking but egocentric), concrete operational (7 to 11 years, logical thinking about concrete objects), and formal operational (12 and beyond, abstract and hypothetical reasoning). Piaget believed children actively construct knowledge through interaction with the environment, and that development proceeds in a fixed sequence though timing can vary.

The zone of proximal development (ZPD) is a concept by Lev Vygotsky describing the gap between what a learner can do independently and what they can achieve with guidance from a more capable partner. Vygotsky argued that learning occurs most effectively within this zone. The concept led to the notion of scaffolding — temporary support gradually withdrawn as the learner gains competence. ZPD underpins much of modern educational psychology and teaching practice.

Adolescence is the developmental period between childhood and adulthood, spanning roughly ages 10 to 24. It involves rapid physical, cognitive, emotional, and social changes. Key psychological tasks include identity formation (Erikson's identity versus role confusion), increasing autonomy, developing peer relationships, and the emergence of formal operational thinking. The adolescent brain, particularly the prefrontal cortex governing impulse control, is not fully mature until the mid-twenties, explaining risk-taking tendencies often observed in this period.

Scaffolding refers to the temporary support provided by a teacher, parent, or more competent peer to help a learner achieve a task beyond their current independent capability. Based on Vygotsky's ZPD, scaffolding is gradually reduced as the learner gains competence until they can perform the task independently. Examples include breaking tasks into steps, providing worked examples, or asking guiding questions. Effective scaffolding challenges the learner without overwhelming them.

Erik Erikson proposed that psychological development occurs through eight stages across the lifespan, each involving a central psychosocial conflict. Examples include trust versus mistrust (infancy), identity versus role confusion (adolescence), and integrity versus despair (old age). Unlike Freud, Erikson emphasised social and cultural influences on development and extended his model across the entire lifespan, not just childhood. Successfully navigating each stage produces a virtue that contributes to a healthy sense of identity and social competence.

Temperament refers to biologically based, relatively stable individual differences in emotional reactivity, sociability, activity level, and self-regulation that appear early in life. Researchers Thomas and Chess identified three broad types: easy (adaptable, positive mood), difficult (intense, irregular, slow to adapt), and slow-to-warm-up (low activity, mild responses, gradual adaptation). Temperament interacts with parenting style and environment through ‘goodness of fit’ — whether the child's temperament matches the demands of their environment.

The nature-nurture debate concerns the relative contributions of genetic inheritance (nature) and environmental experience (nurture) to human development. Contemporary developmental psychology recognises that genes and environment interact in complex ways. The concept of gene-environment interaction (GxE) describes how the effects of genetic factors depend on environmental conditions, and vice versa. Behavioural genetics research using twin and adoption studies attempts to quantify the heritability of traits such as intelligence and personality.

Theory of mind (ToM) is the ability to understand that other people have mental states — beliefs, desires, intentions, and knowledge — that differ from one's own, and to use this understanding to predict and explain their behaviour. Most children develop this ability around age four, as demonstrated by the classic false belief task. Theory of mind is considered a foundational cognitive capacity for social interaction and is impaired in conditions such as autism spectrum disorder.

Organise terms by theorist: Piaget (schemas, assimilation, accommodation, conservation), Vygotsky (ZPD, scaffolding, social learning), Bowlby and Ainsworth (attachment, secure base, internal working model), and Erikson (psychosocial stages, identity). Reading undergraduate introductions such as Berk's Child Development gives you vocabulary in comprehensive context. Open Yale Courses and Khan Academy have free accessible lectures on developmental psychology in English. Practising by explaining theories in your own words, then comparing to original definitions, is the most effective consolidation strategy.