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VCE Psychology (Year 11) · Unit 1 — Psychological Development and Wellbeing · 11m read

Nature, Nurture, and Psychological Development

Ever wonder why you're nothing like your siblings even though you share the same parents? Your psychological development results from both your genes (nature) and your experiences (nurture) working together. Understanding these influences helps you recognize typical developmental milestones—like when kids usually start talking or thinking abstractly—and spot when development might take a different path. This matters for VCE psychology and for understanding yourself and others better.

Learning objective: Describe influences on development and typical vs atypical patterns.

By the end of this lesson you can:

  • I explain nature vs nurture interactions.
  • I describe Erikson's stages.
  • I distinguish typical from atypical development.

Nature is the seed; nurture is the soil. Genes provide potential; environment determines how it grows. Development comes from both.

Development across the lifespan

NATURE AND NURTURE:
• NATURE — genetic, biological, maturational.
• NURTURE — environment, learning, culture.
• INTERACTION — modern view: both inseparable (epigenetics).

HEREDITY:
• Genetic material inherited from parents.
• Twin studies help estimate heritability (e.g., IQ ~50%, height ~80%).

ENVIRONMENT:
• Prenatal (nutrition, stress, teratogens).
• Family, school, culture, socioeconomic status.

PRENATAL RISK FACTORS:
• Alcohol (FASD), tobacco, certain infections.

MATURATION:
• Biological readiness to develop new abilities.
• E.g., crawling before walking.

ERIKSON'S 8 STAGES (psychosocial):
• Trust vs Mistrust (0-1).
• Autonomy vs Shame (1-3).
• Initiative vs Guilt (3-5).
• Industry vs Inferiority (6-11).
• Identity vs Role Confusion (12-18).
• Intimacy vs Isolation (young adult).
• Generativity vs Stagnation (middle adult).
• Integrity vs Despair (late adult).

CRITICAL PERIODS:
• Time windows where specific experiences are essential.
• E.g., language before puberty, visual input in first months.

SENSITIVE PERIODS:
• Easier, not essential.
• E.g., second language acquisition in childhood.

TYPICAL vs ATYPICAL:
• TYPICAL — behaviour common to most at that age.
• ATYPICAL — differs in frequency, intensity or duration.
• Context matters (cultural norms).

CATEGORISING ATYPICAL BEHAVIOUR:
• Statistical deviation, social norms, maladaptive function, personal distress.

EXAMPLES:
• Autism spectrum — neurodevelopmental differences.
• ADHD — attention/activity.
• Anxiety disorders — atypical if persistent and impairing.

INFLUENCES ON DEVELOPMENT:
• Family dynamics.
• Peer groups.
• Culture and media.
• Education.

CONCEPT OF "NORMAL":
• Spectrum, not binary.
• Neurodiversity celebrates variation.

Dev framework

  • Nature: Genes, biology.
  • Nurture: Environment.
  • Interaction: Epigenetics, experience.

Quick reference

| Factor | Example |
|---|---|
| Nature | Genetics, temperament |
| Nurture | Parenting, culture |
| Attachment | Secure, insecure |
| Critical/sensitive periods | Windows for development |
| Biopsychosocial | Integrated view |

Worked example (Medium)

A child shows strong musical ability despite no family history. Discuss nature vs nurture.

  1. Nature. Genetic predispositions for pitch perception, rhythm, working memory for sequences.
  2. Nurture. Exposure to music, parental encouragement, lessons, deliberate practice.
  3. Interaction. Innate aptitude amplified by environment; deliberate practice reshapes neural circuits.

Answer: Both contribute: innate aptitude interacts with environmental opportunities and practice to produce expertise.

Worked example (Hard)

Classic reviews of twin studies (e.g. Bouchard and McGue, 1981) report that identical twins raised apart have IQ correlations of about 0.72, while non-identical twins raised together have correlations of about 0.60. Explain what this suggests about nature and nurture in intelligence.

  1. Identical twins apart. Share 100% genes but different environments. High correlation (about 0.72) suggests a STRONG genetic contribution to IQ.
  2. Non-identical twins together. Share ~50% genes but same environment. Lower correlation (0.60) despite shared environment suggests genes matter more than shared environment alone.
  3. Interaction. Neither correlation is 1.0, so environment also plays a significant role. The difference (0.75 > 0.60) suggests genetics has a larger influence than shared environment, but both matter.

Answer: Twin studies suggest intelligence has a strong genetic component (heritability estimates of roughly 40–80%, rising with age) but environment significantly contributes too. Nature and nurture interact — genes set a potential range that environment actualises.

Common mistakes

  • Arguing that nature OR nurture is solely responsible for behaviour Students present the debate as either/or instead of an interaction Fix: Modern psychology recognises that nature and nurture ALWAYS interact. Even highly heritable traits like height are influenced by nutrition. Always discuss the INTERACTION.
  • Confusing critical and sensitive periods Students use the terms interchangeably Fix: Critical period = experiences are ESSENTIAL during this window (e.g., visual development in first months). Sensitive period = learning is EASIER but still possible later (e.g., second language acquisition).
  • Listing Erikson's stages without explaining the psychosocial crisis Students memorise names but not the challenge at each stage Fix: Each stage involves a CRISIS (e.g., Trust vs Mistrust). Describe both sides: successful resolution builds the positive quality; unsuccessful resolution leads to the negative outcome.

Epigenetics: where nature meets nurture at the molecular level

Epigenetics has revolutionised the nature-nurture debate by showing that environmental experiences can alter how genes are expressed without changing the DNA sequence itself. Chemical tags (methyl groups) attach to genes, switching them on or off in response to environmental signals.

For example, studies with rats showed that offspring who received more maternal grooming had different gene expression patterns in their stress-response systems than neglected offspring — even when the pups were genetically identical. The groomed rats grew up calmer and more resilient, with their stress genes effectively "turned down" by epigenetic changes.

In humans, research on the Dutch Hunger Winter (1944-45) found that children conceived during famine had higher rates of cardiovascular disease, obesity, and mental health issues decades later — and some of these effects appeared in their grandchildren, suggesting epigenetic inheritance across generations.

This means the old "nature vs nurture" framing is fundamentally incomplete. Genes don't operate in a vacuum — they respond to the environment. A person might carry genes associated with anxiety, but whether those genes are expressed depends on childhood experiences, stress levels, nutrition, and social support.

For VCE Psychology, the key takeaway is that biology and environment are inseparable. When VCAA asks about the role of nature and nurture, the strongest answers discuss epigenetics as the mechanism through which environment literally shapes genetic expression, bridging the gap between biology and experience.

Practice questions

  1. Erikson's stage for adolescents is:

    1. Trust vs Mistrust
    2. Identity vs Role Confusion
    3. Intimacy vs Isolation
    4. Generativity vs Stagnation

    (1 marks)

  2. Distinguish between a critical and sensitive period with an example of each.

    (3 marks)

Summary

  • Explain nature vs nurture interactions.
  • Describe Erikson's stages.
  • Distinguish typical from atypical development.

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