What type of study follows a group of people over time to observe changes in behavior?

A longitudinal study is characterized by its ability to follow a group of people over an extended period, allowing researchers to observe changes and developments in behavior, attitudes, or other variables over time. This method is particularly valuable for tracking trends and understanding the dynamics of change within the same group, providing insights into how different factors may influence behavior across various time points.

By collecting data at multiple intervals throughout the study, researchers can identify patterns and correlations that might not be visible in shorter studies. This approach allows for a more in-depth understanding of how individuals or groups evolve, making it an effective design for examining developmental issues, behavioral changes, or the impact of interventions over time.

While a cohort study, which involves tracking a specific group of individuals sharing a common characteristic over time, may seem similar, it is often more focused on specific outcomes related to that particular characteristic or exposure rather than broad changes in behavior. Thus, while both longitudinal and cohort studies span time, the focus of longitudinal studies on the overall change in behavior at multiple points is what distinguishes it as the correct choice in this context.