. Later he written pertaining to the field of psychology. Wundt claimed that the book was "an attempt to mark out [psychology]as a new domain of science" The Principles utilized a system of psychology that sought to investigate the immediate experiences of consciousness, including feelings, emotions, volitions and ideas, mainly explored through Wundt's system of "internal perception", or the self-examination of conscious experience by objective observation of one's consciousness. In 1879, at the University of Leipzig,