Sentence:  In a way, what Fechner tried to do through his inner psychophysics of intensity was to subvert a set of tenacious metaphors—a kind of "<WSD>Supermetaphor</WSD>," governing psychophysiological thinking, that has channeled the thinking of so very many scientists before and after him. Broadly speaking, the <WSD>Supermetaphor</WSD> seeks equivalences in kind between physical and mental processes, as it postulates a strict quantitative as well as qualitative invariance between the structure of mental acts and the underlying physiological activities...... The <WSD>Supermetaphor</WSD> is implicit in attempts by modern scientists to find neural responses that match, quanitatively, some measure of sensation magnitutdes. And it is implicit in Freud. 
Meaning of the word marked with <WSD> tags:  A grounding fact; a correspondance between the underlying truth and our ideas and constructions based on that truth.