| Term | Definition |
|
Accommodation |
(Piagetian) - Adapting one's current understandings (schemas) to incorporate new information. |
|
Adolescence |
The transition period from childhood to adulthood, extending from puberty to independence. |
|
Alzheimer's Disease |
A progressive and irreversible brain disorder characterized by gradual deterioration of memory, reasoning, language, and, finally, physical functioning. |
|
Assimilation |
Interpreting one's new experience in terms of one's existing schemas. |
|
Attachment |
An emotional tie with another person; shown in young children by their seeking closeness to the caregiver and showing distress on separation. |
|
Autism |
A disorder that appears in childhood and is marked by deficient communication, social interaction, and understanding of others' states of mind. |
|
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. |
|
Cognition |
All the mental activities associated with thinking, knowing, remembering, and communicating. |
|
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. |
|
Conservation |
The principle (which Piaget believed to be a part of concrete operational reasoning) that properties such as mass, volume, and number remain the same despite changes in the forms of objects. |
|
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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Cross-sectional Study |
A study in which people of different ages are compared with one another. |
|
Crystallized Intelligence |
One's accumulated knowledge and verbal skills; tends to increase with age. |
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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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Egocentrism |
In Piaget's theory, the inability of the preoperational child to take another's point of view. |
|
Embryo |
The developing human organism from about 2 weeks after fertilization through the second month. |
|
Fetal Alcohol Syndrome |
Physical and cognitive abnormalities in children caused by a pregnant woman's heavy drinking. In severe cases, symptoms include noticeable facial misproportions. |
|
Fetus |
The developing human organism from 9 weeks after conception to birth. |
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Fluid Intelligence |
One's ability to reason speedily and abstractly; tends to decrease during late adulthood. |
|
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. |
|
Gender |
In psychology, the characteristics, whether biologically or socially influenced, by which people define male and female. |
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Gender Identity |
One's sense of being male or female. |
|
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. |
|
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. |
|
Imprinting |
The process by which certain animals form attachments during a critical period very early in life. |
|
Intimacy |
In Erikson's theory, the ability to form close, loving relationships; a primary developmental task in late adolescence and early adulthood. |
|
Longitudinal Study |
Research in which the same people are restudied and retested over a long period. |
|
Maturation |
Biological growth processes that enable orderly changes in behavior, relatively uninfluenced by experience. |
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Menarche |
The first menstrual period. |
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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. |
|
Object Permanence |
The awareness that things continue to exist even when not perceived. |
|
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. |
|
Primary Sex Characteristics |
The body structures (ovaries, testes, and external genitalia) that make sexual reproduction possible. |
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Puberty |
The period of sexual maturation, during which a person becomes capable of reproducing. |
|
Rooting Reflex |
A baby's tendency, when touched on the cheek, to open the mouth and search for the nipple. |
|
Schema |
A concept or framework that organizes and interprets information. |
|
Secondary Sex Characteristics |
Nonreproductive sexual characteristics, such as female breasts and hips, male voice quality, and body hair. |
|
Self-concept |
A sense of one's identity and personal worth. |
|
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. |
|
Social Clock |
The culturally preferred timing of social events such as marriage, parenthood, and retirement. |
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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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Teratogens |
Agents, such as some chemicals and viruses, that can reach the embryo or fetus during prenatal development and cause harm. |
|
Testosterone |
The most important of the male sex hormones. Both males and females have it, but the additional amount in males stimulates the growth of the male sex organs in the fetus and the development of the male sex characteristics during puberty. |
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Theory of Mind |
People's ideas about their own and others' mental states - about their feelings, perceptions, and thoughts and the behavior these might predict. |
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Zygote |
The fertilized egg; it enters a 2-week period of rapid cell division and develops into an embryo. |