Erikson and nature versus nurture: WACE Year 12 Psychology Unit 4
“Describe Erikson's psychosocial stages of development and explain the nature-nurture interaction, including evidence from twin studies”
Erik Erikson proposed that personality develops across eight psychosocial stages, each posing a crisis (such as trust versus mistrust) that must be resolved for healthy development; and the nature-nurture debate asks how genetic inheritance and environment combine to shape behaviour, with twin and adoption studies showing that both interact rather than either acting alone.
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Erikson's psychosocial stages and the nature-nurture debate are not part of the SCSA Psychology ATAR Year 12 syllabus (Units 3 and 4, taught since 2024), so this page is not examined in the WACE Psychology ATAR exam. The nearest Year 12 theory of growth across life is Maslow's hierarchy of needs.
What this dot point is asking
SCSA asks you to outline Erikson's lifespan stages and their crises, define the nature-nurture debate, and explain how twin and adoption studies reveal the interaction of heredity and environment. The marked skill is recognising the relevant stage and arguing for interaction rather than one side.
Erikson's psychosocial stages
Erik Erikson proposed that development continues across the whole lifespan, not just childhood, and that at each stage the person faces a psychosocial crisis between two outcomes. Resolving each crisis well builds a healthy personality; failing to resolve it causes lasting difficulty.
The eight stages and their central crises are:
- Trust versus mistrust (infancy): learning that the world is dependable.
- Autonomy versus shame and doubt (toddlerhood): developing independence.
- Initiative versus guilt (early childhood): asserting control and purpose.
- Industry versus inferiority (school age): developing competence.
- Identity versus role confusion (adolescence): forming a sense of self.
- Intimacy versus isolation (young adulthood): forming close relationships.
- Generativity versus stagnation (middle adulthood): contributing to the next generation.
- Integrity versus despair (late adulthood): reflecting on a life well lived.
A psychosocial crisis is the central conflict at each of Erikson's stages between a positive and a negative outcome (for example trust versus mistrust). The way a person resolves it shapes their personality and influences how they cope with later stages.
The adolescent stage, identity versus role confusion, is especially examinable: teenagers experiment with roles and values to form a stable identity, and failure leads to confusion about who they are.
The nature-nurture debate
The nature-nurture debate concerns the relative contributions of heredity and environment to behaviour and development.
- Nature refers to genetic and biological influences inherited from our parents.
- Nurture refers to environmental influences such as upbringing, culture, learning and experience.
The modern view is interactionist: nature and nurture continually interact. Genes set a range of possibilities, while the environment determines where within that range a person develops. Gene-environment interaction means that the effect of a gene can depend on the environment, and that people partly shape their own environments.
Evidence from twin and adoption studies
Twin and adoption studies are the main tools for separating genetic from environmental influences.
- Identical (monozygotic) twins share all their genes; fraternal (dizygotic) twins share about half. If identical twins are more alike on a trait than fraternal twins, that points to a genetic contribution.
- Twins reared apart who still resemble each other strongly suggest a genetic influence, while differences between them highlight the environment.
- Adoption studies compare adopted children with both their biological and adoptive parents, separating shared genes from shared environment.
These studies consistently show that most psychological traits, such as intelligence and personality, are influenced by both genes and environment, with neither fully determining the outcome.
Studies of identical twins raised in different families find notable similarities in traits such as intelligence and personality, supporting a genetic contribution, while remaining differences confirm that environment also matters. This is strong evidence for the interaction of nature and nurture.
Why this matters
Erikson extends development across the whole lifespan and frames identity formation in adolescence, a key concern for Year 12 students. The nature-nurture interaction underlies all developmental and individual-difference psychology and cautions against simplistic claims that a behaviour is purely genetic or purely learned.
A teenager finding themselves
A 16-year-old tries different friendship groups, music and beliefs, sometimes clashing with their parents as they work out who they want to be.
This is Erikson's identity versus role confusion stage of adolescence. Successfully exploring and committing to a sense of self resolves the crisis as a clear identity; failing to do so leaves the person confused about their role and values.
- Treating nature and nurture as opposites
- The accepted view is interaction: genes and environment work together, so avoid arguing for one side alone.
- Misordering Erikson's stages
- The crises follow a fixed lifespan sequence; identity versus role confusion is adolescence, not childhood.
- Confusing twin types
- Identical twins share all genes; fraternal twins share about half. Greater similarity in identical twins suggests genetic influence.
- Overclaiming from twin studies
- Twin similarities support a genetic contribution but differences confirm the environment matters, so conclusions should be about interaction.
Exam-style questions
Questions in the style of SCSA exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
Original6 marksOutline Erikson's psychosocial stages of development, and explain in detail the crisis faced during adolescence and the consequences of resolving it well or poorly.Show worked answer →
A 6 mark response needs the lifespan structure plus a detailed account of the adolescent stage.
- Structure
- Erikson proposed eight stages across the lifespan, each posing a psychosocial crisis between a positive and negative outcome (for example trust versus mistrust in infancy, integrity versus despair in late adulthood). Resolving each crisis well builds a healthy personality.
- Adolescent crisis
- The fifth stage is identity versus role confusion. Teenagers experiment with different roles, values and beliefs to form a coherent sense of self.
- Consequences
- Successful resolution produces a stable identity and a clear sense of who one is; failure produces role confusion and uncertainty about one's values and direction.
Markers reward recognition of the lifespan sequence and a detailed, correct account of identity versus role confusion and its outcomes.
Original7 marksExplain the nature-nurture debate and discuss, with reference to twin studies, why the modern view is that development arises from an interaction of the two.Show worked answer →
A 7 mark extended response needs the debate, the twin-study evidence, and the interactionist conclusion.
- The debate
- Nature refers to genetic and biological influences inherited from parents; nurture refers to environmental influences such as upbringing, culture and learning.
- Twin studies
- Identical (monozygotic) twins share all their genes while fraternal (dizygotic) twins share about half, so greater similarity in identical twins on a trait suggests a genetic contribution. Studies of identical twins reared apart find notable similarities in intelligence and personality, supporting genetic influence, while their remaining differences show the environment also matters.
- Interaction
- The modern view is interactionist: genes set a range of possibilities and the environment determines where within that range a person develops, with gene-environment interaction meaning a gene's effect can depend on the environment.
- Conclusion
- Markers reward the clear nature-nurture definitions, the logic of twin comparisons, and the conclusion that the two interact rather than one acting alone.