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developmental psychology
a branch of psychology that studies physical, cognitive, and social change throughout the life span.
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zygote
the fertilized egg; it enters a 2-week period of rapid cell division and develops into an embryo.
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embryo
the developing human organism from about 2 weeks after fertilization through the second month.
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fetus
the developing human organism from 9 weeks after conception to birth.
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teratogens
agents, such as chemicals and viruses, that can reach the embryo or fetus during prenatal development and cause harm.
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fetal alcohol syndrome (FAS)
physical and cognitive abnormalities in children caused by a pregnant woman's heavy drinking. In severe cases, symptoms include noticeable facial misproportions.
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rooting reflex
a baby's tendency, when touched on the cheek, to open mouth and search for the nipple.
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habituation
decreasing responsiveness with repeated stimulation. As infants gain familiarity with repeated exposure to a visual stimulus, their interest wanes and they look away sooner.
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maturation
biological growth processes that enable orderly changes in behavior, relatively uninfluenced by experience.
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schema
a concept or framework that organizes and interprets information.
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assimilation
interpreting one's new experience in terms of one's existing schemas.
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accommodation
adapting one's current understandings (schemas) to incorporate new information.
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cognition
all the mental activities associated with thinking, knowing, remembering, and communication.
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sensorimotor stage
in Piaget's theory, the stage (from birth to about 2 years old of age) during which infants know the world mostly in terms of their sensory impressions and motor activities.
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object permanance
the awareness that things continue to exist even when not perceived.
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preoperational stage
in Piaget's theory, the stage ( from about 2 to 6 or 7 years of age) during which a child learns to use language but does not yet comprehend the mental operations of concrete logic.
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conservation
the principle ( which Piaget believed to be a part of concrete operational reasoning) that properties such as mass, volume, and number remains the same despite changes in the forms of objects.
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egocentrism
in Piaget's theory, the preoperational child's inability to take another's point of view.
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theory of mind
People's ideas about their own and others' mental states about their feelings, perceptions, and thoughts and behaviors these might predict.
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concrete operational stage
in Piaget's theory, the stage of cognitive development (from about 6 or 7 to 11 years of age) during ehich children gain the mental operations that enable them to think logically about concrete events.
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formal operational stage
in Piaget's theory, the stage of cognitive development (normally beginning about age 12) during which people begin to think logically about abstract concepts.
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stranger anxiety
the fear of strangers that infants commonly display, beginning by about 8 months of age.
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attachment
an emotional tie with another person; shown in young children by their seeking closeness to the caregiver and showing distress on separation.
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critical period
an optimal period shortly after birth when an organism's exposure to certain stimuli or experiences produces proper development.
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critical period
an optimal period shortly after birth when an organism's exposure to certain stimuli or experiences produces proper development.
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imprinting
the process by which certain animals from attachments during a critical period very early in life.
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basic trust
according to Erik Erikson, a sense that the world is predictable and trustworthy;said to be formed during infancy by appropriate experiences with responsive caregivers.
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adolescence
the transition period from childhood to adulthood, extending from purity to independence.
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puberty
the period of sexual maturation, during which a person becomes capable of reproducing.
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primary sex characteristics
the body structures ( ovaries, testes, and external genitalia) that makes sexual reproduction possible.
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secondary sex characteristics
nonreproductive sexual characteristics, such as female breasts and hips, male voice quality, and body hair.
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menarche
the first menstrual period.
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identity
one's sense of self; according to Erikson, the adolescent's task is to solidify a sense of self by testing and integrating various roles.
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intimacy
in Erikson's theory of, the ability to form close, loving relationships; a primary developmental task in late adolescence and early adulthood.
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menopause
the time of natural cessation of menstruation; also refers to the biological changes a woman experiences as her ability to reproduce declines.
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cross-sectional study
a study in which people of different ages are compared with one another.
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longitudinal study
research in which the same people are restudy and retested over a long period.
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crystallized intelligence
one's accumulated knowledge and verbal skills; tends to increase with age.
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fluid intelligence
one's ability to reason speedily and abstractly; tends to decrease during late adulthood.
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social clock
the culturally preferred timing of social events such as marriages, parenthood, and retirement.
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