LECTURE 13: Lifespan Development II: Adolescence, Adulthood, and Aging

Lifespan Development II

Overview

This section explores psychological development from adolescence through late adulthood, focusing on biological, emotional, cognitive, and social changes. Key topics include puberty, emotional regulation, moral reasoning, identity formation, and the stages and challenges of adulthood and aging.

Adolescence

Puberty

• Definition: Puberty is the process of reaching sexual maturity and the capacity for reproduction. It is regulated by a brain-neuroendocrine process.

• Hormonal Pathway: Hypothalamus → GnRH → Pituitary gland → Gonads

• Primary Sex Characteristics: Changes in sexual organs (e.g., onset of menstruation in girls, spermarche in boys).

• Secondary Sex Characteristics: Other physical changes indicating sexual maturity (e.g., body hair, voice changes).

• Secular Trends: Puberty occurs earlier now than 100 years ago, likely due to improved nutrition and health.

• Consequences: Earlier puberty can lead to increased emotional and social pressures and different gender expectations.

• Brain Development: Frontal lobes continue to mature, enhancing executive functions and self-control.

Emotional Regulation

• Development: Emotional regulation is still maturing during adolescence, contributing to increased emotional volatility.

• Self-Control Strategies:

  • Emotion suppression

  • Shaping emotions

  • Cognitive reframing

• Decision Making: Adolescents are more likely to engage in risk-taking due to ongoing development of the prefrontal cortex (PFC) and the default mode network.

• Influences: Peer pressure, gratification delay, and cultural factors affect emotional regulation.

Moral Reasoning

• Kohlberg's Theory: Moral reasoning develops through stages as individuals resolve moral dilemmas (e.g., the trolley problem).

• Stages of Moral Development:

  • Preconventional Morality: Based on consequences and self-interest.

  • Conventional Morality: Based on social rules and approval of others.

  • Postconventional Morality: Based on abstract principles and justice.

• Social Intuitionist Model: Suggests that moral judgments are often intuitive and emotional rather than strictly rational.

• Knowing vs. Feeling: Knowing what is right/wrong is distinct from feeling that something is right/wrong.

• Example: The trolley problem illustrates conflicts between utilitarian and deontological moral reasoning.

Identity Formation

• Definition: Identity is a clear sense of what kind of person you are, what groups you belong to, and your roles in society.

• Factors Influencing Identity:

  • Peer groups, cliques, and crowds

  • Social exclusion and shame

  • Romantic relationships

  • Gender expectations

  • Risks and drama associated with adolescence

Adulthood & Aging

Emerging vs. Early & Middle Adulthood

• Emerging Adulthood (18-24): Period of continued brain maturation and exploration of identity, relationships, and career paths.

• Early (25-45) & Middle (45-65) Adulthood: Physical changes plateau; important life events include career development, autonomy, and competence.

• Example: Menopause is a significant physical change in middle adulthood.

Love & Marriage

• Marriage Trends: Examines how many people get married and the nature of commitment.

• Happiness: Marriage can increase happiness, but cohabitation and divorce are also common outcomes.

• Relationship Dynamics: The "Four Horsemen of the Apocalypse" (Criticism, Defensiveness, Contempt, Stonewalling) predict relationship breakdown.

Late Adulthood

• Pursuit of Happiness: Socioemotional selectivity theory (SST) suggests older adults prioritize emotionally meaningful goals and relationships.

• Loneliness: Highest in the 20s, dips in mid-40s, and is lowest in the 60s.

• Positivity Effect: Older adults tend to focus more on positive information and experiences.

• Cognitive Decline: Includes structural and functional brain changes, with increased risk of dementia and Alzheimer's disease.

• Neuropathology: Accumulation of neurofibrillary tangles and beta-amyloid plaques, especially in the medial temporal lobe and hippocampus, are hallmarks of Alzheimer's disease.

• Example: Brain scans show significant atrophy in Alzheimer's patients compared to healthy aging adults.

• Can We Improve Cognitive Functioning? Research is ongoing into interventions to slow or prevent cognitive decline.

References

• Key studies and sources are provided for further reading, including research on loneliness and identity formation.

Additional info: Where slides were fragmented or brief, standard academic context and definitions were added for clarity and completeness.