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Explain how a cohort effect could act as a confound in this study. In your response, explain how the study's design makes it vulnerable to this confound and how it might obscure true developmental changes.
Case context: A developmental psychologist conducts a cross-sectional study comparing cognitive flexibility in two groups: a group of 18-year-old high school students and a group of 75-year-old retirees. The psychologist finds that the younger group scores significantly higher on a test of cognitive flexibility and concludes that cognitive flexibility naturally declines with age.
Question: Explain how a cohort effect could act as a confound in this study. In your response, explain how the study's design makes it vulnerable to this confound and how it might obscure true developmental changes.
Sample answer: In this cross-sectional study, the researcher compares two different generations at a single point in time. A cohort effect could act as a confound because the difference in cognitive flexibility might be due to generational differences rather than aging. For instance, the 18-year-olds may have had formal education that emphasized critical thinking and abstract problem-solving, whereas the 75-year-olds grew up with different educational standards. Because the study is cross-sectional, the researcher cannot distinguish between a direct developmental decline in cognitive flexibility and these generational differences, thereby obscuring true developmental changes.
Key points:
- Identify that differences between the age groups may be due to their specific generation (cohort).
- Describe a potential generational difference (e.g., educational differences or life experiences) that could affect cognitive flexibility.
- Explain that cross-sectional research is vulnerable because it compares different cohorts at one point in time, confounding age and generation.
Rubric: The answer should describe how the generational difference (cohort effect) between 18-year-olds and 75-year-olds could explain the differences in test scores. It must explain that the cross-sectional design confounds age and generation, preventing the researcher from identifying true developmental changes.
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Research Methods in Psychology - 4th American Edition @ KPU
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