ABSTRACT
Although the method pursued in building up an integrative basis for primary emotions may have seemed to consist, up to this time, of making a purely logical analysis of neurological results, I may say that the discovery of the four nodal points of primary emotion was the result, originally, of quite a different type of analytical procedure. I had worked for a number of years with systolic blood pressure and reaction-time deception tests, and other physiological measures of emotion, amassing a considerable quantity of unpublished material. I found it impossible to interpret or understand this data without the aid of some tenable hypothesis of basic psycho-neural mechanisms of emotion.
