U3.6 Social-Emotional Development Across the Lifespan
Master AP Psychology 3.6: Erikson's 8 psychosocial stages, the four attachment styles, and Kohlberg's three levels of moral reasoning with clear examples.
What you'll do in this lesson
A voice-first session with the Crimsora tutor on U3.6 Social-Emotional Development Across the Lifespan, then targeted practice and FRQs — with the tutor adapting to where you get stuck.
What this lesson covers
How does a newborn who cries for comfort become an adult wrestling with meaning and legacy? Social-emotional development traces that journey. In this lesson you will learn three frameworks the AP exam loves to test together: Erik Erikson's eight psychosocial stages, the attachment styles first observed in the Strange Situation, and Lawrence Kohlberg's stages of moral reasoning.
These theories share a big idea: development unfolds through predictable challenges, and how we resolve each one shapes who we become. Learn the order, the key conflict or behavior at each step, and the classic study behind it, and you will be ready for both multiple-choice items and the concept-application FRQ.
These theories share a big idea: development unfolds through predictable challenges, and how we resolve each one shapes who we become. Learn the order, the key conflict or behavior at each step, and the classic study behind it, and you will be ready for both multiple-choice items and the concept-application FRQ.
Erikson's Eight Psychosocial Stages
Erik Erikson proposed that people move through eight stages across the lifespan, each defined by a psychosocial crisis — a tension between two outcomes. Successfully resolving a crisis builds a virtue and prepares us for the next stage; failure leaves difficulties that can resurface later.
The exam most often tests the adolescent stage (identity), the middle-adulthood stage (generativity — guiding the next generation), and the final stage (looking back with integrity or regret). A common misconception is that a failed stage cannot be repaired; Erikson believed earlier conflicts can be revisited. Remember the ages line up roughly with a person's life: infancy through old age, in order.
| Stage | Age | Crisis | Positive outcome |
|---|---|---|---|
| 1 | Infancy | Trust vs. Mistrust | Faith that needs will be met |
| 2 | Toddler | Autonomy vs. Shame/Doubt | Independence |
| 3 | Preschool | Initiative vs. Guilt | Purpose, planning |
| 4 | Elementary | Industry vs. Inferiority | Competence |
| 5 | Adolescence | Identity vs. Role Confusion | Sense of self |
| 6 | Young adult | Intimacy vs. Isolation | Close relationships |
| 7 | Middle adult | Generativity vs. Stagnation | Contributing to others |
| 8 | Late adult | Integrity vs. Despair | Acceptance of one's life |
Attachment Styles and the Strange Situation
Attachment is the emotional bond between a child and caregiver. Mary Ainsworth's Strange Situation experiment observed how infants reacted when a caregiver left and returned, revealing distinct styles. Attachment builds on Harry Harlow's monkey studies showing that contact comfort (a soft cloth mother) mattered more than feeding for forming bonds.
Secure attachment is the most common and healthiest pattern. Ambivalent infants both seek and reject comfort — clingy yet inconsolable. Disorganized attachment, added later, involves no coherent strategy and is associated with trauma. Note that temperament (a child's inborn emotional style) also influences attachment, so caregiving is not the only factor. The AP exam may ask you to match a described infant behavior to the correct style.
| Style | Behavior on separation and reunion | Often linked to |
|---|---|---|
| Secure | Distressed when caregiver leaves, comforted on return | Sensitive, responsive care |
| Avoidant | Little distress, ignores caregiver on return | Unresponsive or intrusive care |
| Ambivalent (resistant) | Intense distress, resists comfort on return | Inconsistent care |
| Disorganized | Confused, contradictory reactions | Frightening or chaotic care |
Kohlberg's Levels of Moral Reasoning
Lawrence Kohlberg studied how moral reasoning develops by posing dilemmas — most famously the Heinz dilemma, where a man considers stealing a drug to save his dying wife. Kohlberg cared not about the choice but about the reasoning behind it, which he grouped into three levels.
Preconventional reasoning is typical of children; conventional reasoning emerges in adolescence and dominates adult thinking; postconventional reasoning, based on self-chosen ethical principles, is reached by only some adults. A key exam trap: the same conclusion (steal or don't steal) can appear at any level — the level depends on the justification. Critics, including Carol Gilligan, argued Kohlberg's framework emphasized justice over care and may reflect a male-centered view of morality.
| Level | Reasoning focus | Example logic |
|---|---|---|
| Preconventional | Avoiding punishment, gaining reward | "He shouldn't steal because he'll go to jail." |
| Conventional | Social approval, law and order | "He shouldn't steal because it's against the law." |
| Postconventional | Abstract principles, universal ethics | "He should steal because a life is worth more than property." |
How the Exam Connects These Theories
AP questions frequently blend all three frameworks in a single free-response prompt, asking you to apply each to a scenario about one person. To answer well, always tie the theorist's concept to specific behavior in the vignette rather than merely naming the stage.
A reliable strategy is to anchor each theory to its core question. Erikson asks, "What life conflict is this person facing right now?" Attachment theory asks, "How does this person respond to closeness and separation?" Kohlberg asks, "Why does this person say an action is right or wrong?"
Watch for common mix-ups. Erikson (psychosocial) is often confused with Freud's psychosexual stages, but Erikson emphasizes social relationships across the entire lifespan, not just childhood. Attachment style describes an emotional bond, not a personality trait. And Kohlberg measures reasoning, not the moral choice itself. On multiple-choice items, the wrong answers usually swap these distinctions — for example, calling avoidant attachment a moral stage, or labeling identity confusion as stagnation. Precise vocabulary earns points, so practice matching each term to its exact definition and typical developmental period.
A reliable strategy is to anchor each theory to its core question. Erikson asks, "What life conflict is this person facing right now?" Attachment theory asks, "How does this person respond to closeness and separation?" Kohlberg asks, "Why does this person say an action is right or wrong?"
Watch for common mix-ups. Erikson (psychosocial) is often confused with Freud's psychosexual stages, but Erikson emphasizes social relationships across the entire lifespan, not just childhood. Attachment style describes an emotional bond, not a personality trait. And Kohlberg measures reasoning, not the moral choice itself. On multiple-choice items, the wrong answers usually swap these distinctions — for example, calling avoidant attachment a moral stage, or labeling identity confusion as stagnation. Precise vocabulary earns points, so practice matching each term to its exact definition and typical developmental period.
Key terms
- Psychosocial crisis.
- The central conflict at each of Erikson's eight stages; resolving it builds a strength that supports later development.
- Identity vs. Role Confusion.
- Erikson's adolescent stage in which a person forms a coherent sense of self by exploring roles, values, and goals.
- Generativity vs. Stagnation.
- Erikson's middle-adulthood stage focused on contributing to the next generation versus feeling unproductive.
- Strange Situation.
- Mary Ainsworth's procedure observing infant reactions to a caregiver's departure and return to classify attachment style.
- Secure attachment.
- Pattern in which an infant is distressed at separation but readily comforted upon the caregiver's return.
- Contact comfort.
- The comfort derived from physical touch; shown by Harlow to be more important than feeding for forming attachment.
- Preconventional morality.
- Kohlberg's first level, where moral reasoning centers on avoiding punishment and gaining personal rewards.
- Postconventional morality.
- Kohlberg's highest level, where reasoning relies on abstract, self-chosen ethical principles such as justice and human rights.
Worked example
Maya, age 16, argues with her parents that she should be allowed to skip a mandatory school assembly because "an unjust rule shouldn't override a person's right to spend time meaningfully." As a toddler, Maya reportedly cried intensely whenever her mother left but pushed her away and could not be soothed when she returned. Using Erikson, attachment theory, and Kohlberg, describe Maya's development.
Start with Erikson. At 16, Maya is in the Identity vs. Role Confusion stage. Her willingness to challenge her parents and define her own values reflects an active search for a personal identity rather than simply accepting imposed roles.
Next, attachment. As a toddler she showed intense distress at separation yet resisted comfort on reunion, both seeking and rejecting her mother. This describes ambivalent (resistant) attachment, often linked to inconsistent caregiving. Avoid confusing this with avoidant attachment, in which the child shows little distress at all.
Finally, Kohlberg. Maya justifies breaking the rule by appealing to an abstract principle — a person's right to meaningful time and the idea that an unjust rule loses authority. Because her reasoning rests on self-chosen ethical principles rather than punishment or law, it fits postconventional morality. Notice that we classify the reasoning, not whether skipping the assembly is truly right.
A complete FRQ answer names each concept and ties it to a specific detail from Maya's description.
Next, attachment. As a toddler she showed intense distress at separation yet resisted comfort on reunion, both seeking and rejecting her mother. This describes ambivalent (resistant) attachment, often linked to inconsistent caregiving. Avoid confusing this with avoidant attachment, in which the child shows little distress at all.
Finally, Kohlberg. Maya justifies breaking the rule by appealing to an abstract principle — a person's right to meaningful time and the idea that an unjust rule loses authority. Because her reasoning rests on self-chosen ethical principles rather than punishment or law, it fits postconventional morality. Notice that we classify the reasoning, not whether skipping the assembly is truly right.
A complete FRQ answer names each concept and ties it to a specific detail from Maya's description.
Practice questions
An infant in the Strange Situation shows little distress when the caregiver leaves and actively avoids the caregiver upon return. Which attachment style does this best illustrate?
- Secure attachment
- Avoidant attachment
- Ambivalent attachment
- Disorganized attachment
Answer: Avoidant attachment
Avoidant infants display minimal distress at separation and ignore or avoid the caregiver on reunion. Secure infants are distressed but comforted; ambivalent infants are intensely distressed and resist comfort; disorganized infants show confused, contradictory behaviors.
A 45-year-old volunteers to mentor teenagers and mmentions feeling fulfilled by "helping the next generation succeed." Identify the Erikson stage this reflects and explain the conflict involved.
Answer: Generativity vs. Stagnation.
In middle adulthood, Erikson's crisis is Generativity vs. Stagnation. Generativity means contributing to society and guiding younger people; failure leads to stagnation, a sense of being unproductive or self-absorbed. The mentor's satisfaction from helping teens reflects successful generativity.
Two students both say Heinz should not steal the drug. Student A says, "He'll get arrested," while Student B says, "Laws exist to keep society orderly and must be respected." Explain which Kohlberg level each student demonstrates.
Answer: Student A is preconventional; Student B is conventional.
Kohlberg classifies reasoning, not the choice. Student A focuses on avoiding punishment, which is preconventional. Student B appeals to maintaining law and social order, which is conventional. The identical conclusion does not determine the level — the justification does.
FAQ
- What is the difference between Erikson's and Freud's stages?
- Both describe stages of development, but Erikson's are psychosocial, emphasizing social relationships and identity across the entire lifespan, from infancy to old age. Freud's psychosexual stages focus on bodily pleasure zones and largely end in childhood. The AP exam often contrasts the two, so remember Erikson has eight stages covering all of life.
- How do I remember the order of Erikson's stages?
- Link each stage to a natural life phase: trust in infancy, autonomy as a toddler, initiative in preschool, industry in elementary school, identity in adolescence, intimacy in young adulthood, generativity in middle age, and integrity in late adulthood. Because the ages progress in order, matching the crisis to the appropriate age usually reveals the sequence.
- Does the answer to a Kohlberg dilemma matter for scoring the level?
- No. Kohlberg classified the reasoning behind a decision, not the decision itself. Someone could say "steal" or "don't steal" at any level. Focus on the justification: punishment and reward signal preconventional, social approval and law signal conventional, and abstract ethical principles signal postconventional.
- Are attachment styles permanent?
- Not necessarily. Early attachment tends to be stable but can change with new relationships and experiences, and temperament also shapes it. On the AP exam, treat attachment as an emotional pattern formed largely through caregiving quality, not as a fixed lifelong label.
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