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 week 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
monster maker; 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 pregnant woman’s heavy drinking
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habituation
decreasing responsiveness with repeated stimulation
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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 our new experiences in terms of our existing schemas
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accommodation
adapting our current understandings (schemas) to incorporate new information
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sensorimotor stage
in Piaget’s theory, the stage (from birth to about 2 years of age) during which infants know the world mostly in terms of their sensory impressions and motor activities
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object permanence
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 about 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 that properties such as mass, volume, and number remain the same despite changes in the forms of objects
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egocentrism
in Piaget’s theory, the preoperational child’s difficulty taking another’s point of view
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theory of mind
people’s ideas about their own and other’s mental states -- about their feelings, perceptions, and thoughts, and the behaviors these might predict
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autism spectrum disorder (ASD)
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
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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 which 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
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critical period
an optimal period early in the life of an organism when exposure to certain stimuli or experiences produces normal development
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imprinting
the process by which certain animals form strong attachments during an early-life critical period
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temperament
a person’s characteristic emotional reactivity and intensity
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basic trust
according to Erik Erikson, a sense that the world is predictable and trustworthy
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self-concept
all our thoughts and feelings about ourselves, in answer to the questions, “Who am I?”
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gender
the socially constructed roles and characteristics by which a culture defines male and female
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aggression
any physical or verbal behavior intended to hurt or destroy
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gender role
a set of expected behaviors for males and for females
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role
a set of expectations (norms) about a social position, defining how those in the position ought to behave
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gender identity
our sense of being male or female
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social learning theory
the theory that we learn social behavior by observing and imitating and by being rewarded or punished
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gender typing
the acquisition of a traditional masculine or feminine role
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transgender
an umbrella term describing people whose gender identity or expression differs from that associated with their birth sex
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adolescence
the transition period from childhood to adulthood, extending from puberty to independence
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identity
our sense of self
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social identity
the “we” aspect of our self-concept
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intimacy
in Eriksons’s theory, the ability to form close, loving relationships; a primary developmental task in late adolescence and early adulthood
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emerging adulthood
for some people in modern cultures, a period from the late teens to mid-twenties, bridging the gap between adolescent dependence and full independence and responsible adulthood
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X chromosome
the sex chromosome found in both men and women (females have two, males have one; an X chromosome from each parent produces a female child)
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Y chromosome
the sex chromosome found only in males (when paired with an X chromosome from the mother, it produces a male child)
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testosterone
the most important of the male sex hormones
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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 that make sexual reproduction possible (ovaries, testes, & external genitalia)
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secondary sex characteristics
nonreproductive sexual traits, 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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AIDS (acquired immune deficiency syndrome)
a life-threatening, sexually transmitted infection caused by the human immunodeficiency virus; depletes the immune system, leaving the person vulnerable to infection
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sexual orientation
an enduring sexual attraction toward members of either one’s own sex, the other sex, or both sexes
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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 reproduces 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 restudied and retested over a long period
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social clock
the culturally preferred timing of social events such as marriage, parenthood, and retirement