Describe at least 4 types of research that would be used in studying abnormal psychology.

NOTE: In abnormal psychology, research focuses on hypotheses meant to explain the nature, the causes, or the treatment of a disorder.

1. The individual case study is used to study one or more individuals in depth. Although case studies have an important role in the theoretical development of psychology, they are not subject to experimental control and must necessarily be suspect in terms of both internal and external validity.

2. Research by correlation can tell us whether a relationship exists between two variables, but it does not tell us if that relationship is a causal one. Epidemiological research is a type of correlational research that reveals the incidence, distribution, and consequences of a particular problem in one or more populations.

3. Research by experiment can follow one of two designs: group or single case. In both designs, a variable (or variables) is manipulated and the effects are observed to determine the nature of a causal relationship.

4. Genetic research focuses on the role of genetics in behavior. These research strategies include family studies, adoption studies, twin studies, genetic linkage analyses, and association studies.

5.Research strategies that examine psychopathology across time include cross-sectional and longitudinal designs. Both focus on differences in behavior or attitudes at different ages, but the former does so by looking at different individuals at different ages and the latter looks at the same individuals at different ages.

6. Prevention research can be viewed in four broad categories: health promotion or positive development strategies, universal prevention strategies, selective prevention strategies, and indicated prevention strategies.

The more the findings of a research program are replicated, the more they gain in credibility.

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