Most Developmental Psychology Studies Use Either Longitudinal or Cross-Sectional Research

Most developmental psychology studies use either longitudinal or cross-sectional research designs. Describe how a developmental psychologist could use a longitudinal design to study changes in fluid and crystallized intelligence as adults age. Then describe a similar cross-sectional study. Based on what you read about longitudinal and cross-sectional studies in Chapter 2 (How Psychologists Do Research), is it possible that the cross-sectional and longitudinal studies you propose could find conflicting results? If so, explain how.