a psychologist observes how over time an elderly person’s behavior

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a psychologist observes how over time an elderly person’s behavior deteriorates at home because of their alzheimer’s disease and later publishes an account of it. the method he uses is called

Developmental psychologists focus on human growth and changes across the lifespan, including physical, cognitive, social, intellectual, perceptual, personality and emotional growth.
    1. Case study
    2. The survey
    3. Laboratory observation
    4. Correlational research