Dr.Okawa is interested in studying the effect that neurological trauma can have on short-term memory.First, he collects detailed information from a small number of individuals who have experienced brain damage.Then, using information provided by medical records, interviews, and observations, Dr.Okawa attempts to create an in-depth portrait of each individual.What type of research method was used in this study?

A) case study
B) naturalistic observation
C) experimental method
D) surveys

The research method used in this study is a case study, as detailed information is collected from a small number of individuals who have experienced brain damage. Additionally, the goal is to create an in-depth portrait of each individual, which is a key characteristic of a case study. Naturalistic observation would involve observing individuals in their natural environment, which is not the focus of this study. The experimental method involves manipulating variables to determine cause and effect, which is not being done here. Surveys involve collecting data from a larger sample through standardized questions, but the study is focusing on a small number of individuals in-depth.