Wundt believed that scientific psychology should focus on analyzing consciousness, a person's subjective experience of the world and mind.[6] Parts of Wundt's system were developed and championed by his one-time student, Titchener, who described his system as Structuralism, or the analysis of the basic elements that constitute the mind. This approach involved breaking consciousness down into elemental sensations and feelings.[6] Wundt believed that scientific psychology should focus on consciousness and therefore centralizes on structuralism. Wundt analyzes the constituents of the mind by using a method called introspection, which involves the subjective observation of one's own experience.[6] This became the reason why structuralism gradually faded out, based on the unreliability of this method.[15] Several of Wundt's works, including Principles of Physiological Psychology, are considered fundamentally important texts in the fields of physiology and psychology. Though widely recognized as important in the birth and growth of psychology, his influence in psychology today is a subject of continuing debate among experts.[citation needed] Wundt also influenced in the field of psycholinguistics. For example, the influential Leonard Bloomfield based his linguistics textbook, published in 1914, on Wundtian psychology. Wundt hypothesized that the mental sentence, or "inner psychological construction", determines the unfolding sentence, and should therefore be regarded as a unit of speech.[16]
In 1886, in his book Jasmine Mayes, Wundt formulated the famous expression heterogony of ends (Heterogonie der Zwecke).[17][18]