OSAT Family and Consumer Sciences (109)

Human development is the scientific study of how people change and how they stay the same over time. This field examines physical, cognitive, social, and emotional changes that occur throughout the lifespan from conception through death.

Development is multidimensional, meaning it involves biological, cognitive, and socioemotional processes. These dimensions interact with each other constantly. A child experiencing malnutrition (biological) may have difficulty concentrating in school (cognitive) and may withdraw from peers (socioemotional).

Development is also multidirectional. Some aspects of development increase while others decrease. For example, vocabulary typically increases throughout adulthood, while processing speed may decline with age. Development is plastic, meaning it can be modified by experience and intervention at any point in life.

The nature versus nurture debate considers whether development is primarily influenced by genetics (nature) or environment (nurture). Contemporary understanding recognizes that both factors interact continuously. Genes may predispose individuals toward certain traits, but environmental factors determine how those predispositions are expressed.

Critical periods are specific times during development when certain experiences must occur for normal development to proceed. Sensitive periods are times when organisms are particularly responsive to certain environmental stimuli, though development can still occur outside these periods with more difficulty.

Normative age-graded influences are biological and environmental factors that are similar for individuals in a particular age group. Normative history-graded influences are common to people of a particular generation because of historical circumstances. Non-normative life events are unusual occurrences that have major impact on individual lives.

Psychoanalytic theories emphasize unconscious processes and early childhood experiences. Sigmund Freud proposed that personality develops through five psychosexual stages: oral, anal, phallic, latency, and genital. Fixation at any stage results in personality characteristics associated with that stage.

Erik Erikson expanded psychoanalytic theory to encompass the entire lifespan with eight psychosocial stages. Each stage involves a crisis that must be resolved for healthy development. The stages are trust versus mistrust (infancy), autonomy versus shame and doubt (toddlerhood), initiative versus guilt (early childhood), industry versus inferiority (middle childhood), identity versus role confusion (adolescence), intimacy versus isolation (young adulthood), generativity versus stagnation (middle adulthood), and integrity versus despair (late adulthood).

Cognitive theories focus on how thinking processes develop. Jean Piaget proposed four stages of cognitive development. The sensorimotor stage (birth to 2 years) involves learning through sensory experiences and motor actions. Object permanence develops during this stage. The preoperational stage (2 to 7 years) involves symbolic thinking but is characterized by egocentrism and centration. The concrete operational stage (7 to 11 years) involves logical thinking about concrete objects. Conservation is mastered during this stage. The formal operational stage (11 years and beyond) involves abstract and hypothetical thinking.

Lev Vygotsky emphasized the social and cultural context of cognitive development. The zone of proximal development is the distance between what a learner can do independently and what they can do with guidance. Scaffolding involves providing appropriate assistance that is gradually withdrawn as competence increases. Private speech is self-directed talk that guides thinking and action.

Behavioral and social learning theories focus on observable behavior and learning through environmental interactions. Classical conditioning involves learning through association of stimuli. Operant conditioning involves learning through consequences of behavior. Reinforcement increases behavior while punishment decreases it. Albert Bandura's social learning theory emphasizes observational learning and modeling. Self-efficacy is the belief in one's ability to succeed in specific situations.

Ecological systems theory, developed by Urie Bronfenbrenner, views development as occurring within interconnected environmental systems. The microsystem includes immediate environments like family and school. The mesosystem involves connections between microsystems. The exosystem includes settings that indirectly affect the individual. The macrosystem encompasses cultural values and customs. The chronosystem involves patterns of environmental events over time.

Attachment theory, developed by John Bowlby and Mary Ainsworth, focuses on emotional bonds between caregivers and infants. Secure attachment develops when caregivers are consistently responsive. Insecure-avoidant attachment develops when caregivers are consistently unresponsive. Insecure-resistant attachment develops when caregivers are inconsistently responsive. Disorganized attachment develops in situations of fear or trauma.