Final answer:
Wilhelm Wundt employed a method called introspection, where participants reported their mental experiences, central to the structuralism school of thought in psychology.
Step-by-step explanation:
Wilhelm Wundt, a pioneer in psychology, utilized a technique where his research participants would verbally report their mental experiences as they occurred. This method is called introspection, and it was central to Wundt's approach to understanding conscious experience. Introspection involved examining one's own thoughts and feelings as objectively as possible, with the aim to unravel the structures of the mind. Wundt is associated with the school of thought known as structuralism, which focused on breaking down mental processes into the most basic elements.