Development Over the Lifespan: Key Concepts in Developmental Psychology

Development Over the Lifespan

Overview

Developmental psychology examines how people change and grow throughout their lives, from infancy through old age. This field explores physical, cognitive, social, and emotional changes, as well as the factors that influence development.

Developmental Periods: Adolescence and Emerging Adulthood

Adolescence and emerging adulthood are critical periods marked by significant transitions in identity, independence, and social roles.

• Adolescence: The period between childhood and adulthood, typically beginning with puberty and ending with the assumption of adult roles.

• Emerging Adulthood (Arnett, 2004): A distinct developmental stage in industrialized societies, spanning late teens through mid-twenties, characterized by exploration and instability.

Key Features of Emerging Adulthood:

• Identity explorations

• Instability

• Self-focused

• Feeling of in-between

• Possibilities

Variations in Emerging Adulthood: Cultural, gender, and ethnic differences may influence the experience and duration of emerging adulthood.

Example: In some cultures, emerging adulthood is shortened or absent due to earlier assumption of adult responsibilities.

Relationships and Attachment

Attachment theory explains how early relationships with caregivers shape later social and emotional development.

• Secure Attachment: Associated with better friendships, positive self-concepts, and persistence.

• Attachment Styles: Patterns of relating to others in close relationships, including secure, anxious, and avoidant styles.

• "Birds of a feather flock together": People with similar attachment styles often form relationships.

• Attachment is not predetermined: It can change based on experiences and relationships.

Longitudinal Research: Studies show that early interpersonal experiences with caregivers predict attachment orientations in adulthood, affecting relationships with parents, friends, peers, and romantic partners.

Attachment Style	Characteristics	Outcomes
Secure	Comfortable with intimacy and autonomy	Healthy relationships, positive self-concept
Anxious	Preoccupied with relationships, fear of abandonment	Relationship anxiety, emotional volatility
Avoidant	Difficulty with intimacy, prefers independence	Emotional distance, less satisfaction in relationships

Additional info: Attachment orientations can be measured using self-report scales, and are influenced by both early caregiving and later relationship experiences.

Developmental Changes in Late Life

Late adulthood involves changes in physical, cognitive, and emotional domains.

• Memory: Some decline in memory and processing speed is typical.

• Sensory Changes: Hearing and vision may decline, affecting daily functioning.

• Expertise: Older adults often retain or improve in areas of expertise.

• Personality: Personality is relatively stable but may become more consistent with age.

• Well-being: Many older adults report high levels of positive feelings, possibly due to emotion regulation goals and meaningful social relationships.

"Recipe" for Successful Aging:

• Avoid disease, disability, and risk

• Engage in physical and cognitive exercise

• Maintain social and meaningful activities

Language Development

Language acquisition is a rapid and complex process that occurs early in life, typically without explicit instruction.

• Generativity: Language allows for the creation of infinite utterances from a finite set of words and rules.

• Grammar (Syntax): Rules specify how words can be combined into sentences.

• Creativity: Children produce new sentences and meanings, demonstrating the generative nature of language.

• Universality: All children, regardless of culture, acquire the language(s) they are exposed to.

Stages of Language Acquisition:

• Babbling (around 6 months)

• One-word stage (around 12 months)

• Two-word stage (around 18-24 months)

• Complex sentences (by age 4)

Example: The word "tweet" has acquired new meanings over time, illustrating language change and creativity.

Cognitive Development: Piaget's Stages

Jean Piaget proposed that children progress through distinct stages of cognitive development, each characterized by different ways of thinking.

Stage	Approximate Age	Key Features
Sensorimotor	0-2 years	Object permanence, sensory exploration
Preoperational	2-7 years	Symbolic thinking, egocentrism, lack of conservation
Concrete Operational	7-11 years	Logical thinking, conservation, reversibility
Formal Operational	12+ years	Abstract reasoning, hypothetical thinking

Example: A child in the preoperational stage may believe that a taller container holds more liquid, even if the amount is the same (lack of conservation).

Attachment: Harlow's Monkeys

Harry Harlow's research with rhesus monkeys demonstrated that attachment is primarily based on comfort and closeness, rather than the provision of food.

• Infant monkeys preferred soft, cloth "mothers" over wire "mothers" that provided food.

• Attachment provides a secure base for exploration and emotional development.

Implication: Emotional bonds and physical comfort are crucial for healthy psychological development.

Key Equations and Concepts

• Attachment Anxiety and Avoidance (from research):

$R^2_{attachment\ anxiety} = 3\%$ $R^2_{avoidance} = 9\%$

Additional info: These values indicate the proportion of variance in adult attachment explained by early relationship quality.