Psychorheology: Links Between the Past and the Present*

A brief discussion is given concerning the validity of psychophysics as a science with special reference to psychorheology. Some early work on psychorheology concerned mainly with cutaneous and kinaesthetic sensations is discussed. A distinction is made between connotative and denotative concepts; difficulties in defining the latter are stressed, with special reference to translating into other languages. Denotative concepts are to be regarded as processes rather than as properties; i.e., properties changing with time often as a result of the testing. It was suggested long ago that these time‐differentials should be fractional, and it is proposed that ‐ in spite of mathematical difficulties ‐ fractional differential equations might serve as a useful adjunct to the ‘consistency profiling’ now in wide use.