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developmental psychology

a branch of psychology that studies physical, cognitive, and social change throughout the life span

Zygotes

the fertilized egg; it enters a 2-week period of rapid cell division and develops into an embryo

embryo

the developing human organism from about 2 weeks after fertilization through the second month

Teratogens

agents, such as chemicals and viruses, that can reach the embryo or fetus during prenatal development and cause harm

fetal alcohol syndrome

physical and cognitive abnormalities in children caused by a pregnant woman's heavy drinking. In severe cases, signs include a small out of proportion head and abnormal facial features

Habituation

decreasing responsiveness with repeated exposure to a stimulus

Maturation

biological growth processes that enable orderly changes in behavior, relatively uninfluenced by experience

cognition

all the mental activities associated with thinking, knowing, remembering, and communicating

Schemas

a concept or framework that organizes and interprets information

assimilate

interpreting our new experiences in terms of our existing schemas

accommodate

in developmental psychology adapting our current understandings to incorporate new information

sensorimotor stage

in Piaget's theory, the stage during which infants know the world mostly in terms of their sensory impressions and motor activities

object permanence

the awareness that things continue to exist even when not perceived

preoperational stage

in Piaget's theory, the stage during which a child learns to use language but does not yet comprehend the mental operations of concrete logic

conservation

the principle that properties such as mass, volume, and number remain the same despite changes in the forms of objects

egocentric

the preoperational child's difficulty taking another's point of view

scaffold

a framework that offers children temporary support as they develop higher levels of thinking

Autism Spectrum Disorder

a disorder that appears in childhood and is marked by significant deficiencies in communication and social interaction, and by rigidly fixated interests and repetitive behaviors

stranger anxiety

the fear of strangers that infants commonly display, beginning by about 8 months of age

attachement

an emotional tie with another person; shown in young children by their seeking closeness to the caregiver and showing distress on separation

critical period

An optimal period early in life when exposure to certain stimuli or experiences produces normal development

Imprinting

the process by which certain animals form attachments during a critical period very early in life

strange situation

a procedure for studying child-caregiver attachment; a child is placed in an unfamiliar environment while their caregiver leaves and then returns, and the child's reactions are observed

secure attachment

demonstrated by infants who comfortably explore environments in the presence of their caregiver, show only temporary distress when the caregiver leaves, and find comfort in the caregiver's return

insecure attachment

demonstrated by infants who display either a clinging, anxious attachment or an avoidant attachment that resists closeness

temperament

a person's characteristic emotional reactivity and intensity

basic trust

a sense that the world is predictable and trustworthy; said to be formed during infancy by appropriate experiences with responsive caregivers

self-concept

all our thoughts and feelings about ourselves, in answer to the question, "Who am I?"

gender

in psychology, the biologically and socially influenced characteristics by which people define male and female

sex

the biologically influenced characteristics by which people define males and females

aggression

any physical or verbal behavior intended to harm someone physically or emotionally

relation aggression

an act of aggression intended to harm a person's relationship or social standing

role

a set of expectations about a social position, defining how those in the position ought to behave

gender roles

a set of expected behaviors, attitudes, and traits for males or for females

gender identity

our sense of being male, female, or some combination of the two

social learning theory

the theory that we learn social behavior by observing and imitating and by being rewarded or punished

gender typing

the acquisition of a traditional masculine or feminine role

Androgyny

displaying both traditional masculine and feminine psychological characteristics

Transgender

an umbrella term describing people whose gender identity or expression differs from that associated with their birth sex

adolescence

the transition period from childhood to adulthood, extending from puberty to independence

puberty

the period of sexual maturation, during which a person becomes capable of reproducing

identity

our sense of self; the adolescent's task is to solidify a sense of self by testing and integrating various roles

social identity

the "we" aspect of our self-concept; the part of our answer to "Who am I?" that comes from our group memberships

intimacy

the ability to form close, loving relationships; primary developmental task in young adulthood

emerging adulthood

a period from about age 18 to the mid-twenties, when many in Western cultures are no longer adolescents but have not yet achieved full independence as adults

X chromosome

The sex chromosome found in both men and women. Females have two X chromosomes; males have one. An X chromosome from each parent produces a female child.

Y chromosome

the sex chromosome found only in males. When paired with an X chromosome from the mother, it produces a male child.

Testosterone

the most important of the male sex hormones. Both males and females have it, but the additional testosterone in males stimulates the growth of the male sex organs in the fetus and the development of the male sex characteristics during puberty

primary sex characteristics

the body structures (ovaries, testes, and external genitalia) that make sexual reproduction possible

secondary sex succession

nonproductive sexual traits, such as female breasts and hips, male voice quality and body hair

spermarche

first ejaculation

menarche

the first menstrual period

Intersex

a condition present at birth due to unusual combinations of male and female chromosomes, hormones, and anatomy; possessing biological sexual characteristics of both sexes

AIDS

a life-threatening, sexually transmitted infection caused by the human immunodeficiency virus (HIV). AIDS depletes the immune system, leaving the person vulnerable to infections.

sexual orientation

our enduring sexual attraction, usually toward members of our own sex (homosexual orientation) or the other sex (heterosexual orientation); variations include attraction toward both sexes (bisexual orientation)

menopause

the time of natural cessation of menstruation; also refers to the biological changes a woman experiences as her ability to reproduce declines

cross-sectional studies

research that compares people of different ges at the same point of life

Longitude studies

research that follows and retests the same people over time

neurocognitive disorders

acquired (not lifelong) disorders marked by cognitive deficits; often related to Alzheimer's disease, brain injury or disease, or substance abuse. In older adults neurocognitive disorders were formerly called dementia

Alzheimer's disease

a neurocognitive disorder marked by neural plaques, often with an onset after age 80, and entailing a progressive decline in memory and other cognitive abilities

social clock

the culturally preferred timing of social events such as marriage, parenthood, and retirement