Gustav Fechner
Fechner, along with Wilhelm Wundt and Hermann von Helmholtz, is recognized as one of the founders of modern experimental psychology. His clearest contribution was the demonstration that because the mind was susceptible to measurement and mathematical treatment, psychology had the potential to become a quantified science. Theorists such as Immanuel Kant had long stated that this was impossible, and that therefore, a science of psychology was also impossible.
Structuralism (psychology)
Structuralism in psychology (also structural psychology) is a theory of consciousness developed by Wilhelm Wundt and his student Edward Bradford Titchener. This theory was challenged in the 20th century. It is debated who deserves the credit for finding this field of psychology, but it is widely accepted that Wundt created the foundation on which Titchener expanded. Structuralism as a school of psychology seeks to analyze the adult mind (the total sum of experience from birth to the present) in terms of the simplest definable components and then to find how these components fit together to form more complex experiences as well as how they correlate to physical events. To do this, psychologists employ introspection, self-reports of sensations, views, feelings, emotions, etc.