| Alzheimer's disease | a progressive and irreversible brain disorder characterized by gradual deterioration of memory, reasoning, languages, and, finally, physical functioning |
| 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 |
| fluid intelligence | one's ability to reason speedily and abstractly; tends to decrease during late adulthood |
| 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 |
| menarche | the first menstrual period |
| primary sex characteristics | the body structures (ovaries, testes, and external genitalia) that make sexual reproduction possible |
| schema | a concept or framework that organizes and interprets information |
Drag corresponding items onto each other to make them disappear.
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