Wundt later wrote the Principles of Physiological Psychology (1874), which helped establish experimental procedures in psychological research. After taking a position at the University of Liepzig, Wundt founded the first of only two experimental psychology labs in existence at that time. (Although a third lab already existed - William James established a lab at Harvard, which was focused on offering teaching demonstrations rather than experimentation. G. Stanley Hall founded the first American experimental psychology lab at John Hopkins University).
Wundt was associated with the theoretical perspective known as structuralism, which involves describing the structures that compose the mind. He believed that psychology was the science of conscious experience and that trained observers could accurately describe thoughts, feelings, and emotions through a process known as introspection.
However, Wundt made a clear distinction between introspection, which he believed was inaccurate, and internal perception. According to Wundt, internal perception involved a properly trained observer who was aware when a stimulus of interest was introduced. Wundt's process required the observer to be keenly aware and attentive of their thoughts and reactions to the stimulus and involved multiple presentations of the stimulus. Of course, because this process relies on personal interpretation, it is highly subjective. Wundt believed that systematically varying the conditions of the experiment would enhance the generality of the