experiences are represented which since primeval time have happened on this planet. Their archetypal distinctness is the more marked, the more frequently and intensely they have been experienced. The archetype would be—to borrow from Kant—the noumenon of the image which intuition perceives and, in perceiving, creates." Jung differentiates introverted intuition and introverted sensation by writing that introverted sensation is 'confined' to the perception of events, while introverted intuition instead perceives "the image which has really occasioned the innervation", repressing its actual qualities. He uses an example of "a psychogenic attack of giddiness", writing that sensation will perceive the qualities and sensations of the giddiness without paying attention to the image that caused it. Intuition, on the other hand, does perceives on the image that caused it, perceiving it and its course in a very detailed manner rather than the giddiness itself, which is "the image of a tottering man pierced through the heart by an arrow". "For intuition, therefore, the unconscious images attain to the dignity of things or objects. But, because intuition excludes the cooperation of sensation, it obtains either no knowledge at all or at the best a very inadequate awareness of the innervation-disturbances or of the physical effects produced by the unconscious images. Accordingly, the images appear as though detached from the subject, as though existing in themselves without relation to the person. Consequently, in the above-mentioned example, the introverted intuitive, when affected by the giddiness, would not imagine that the perceived image might also in some way refer to himself. Naturally, to one who is rationally orientated, such a thing seems almost unthinkable, but it is none the less a fact, and I have often experienced it in my dealings with this type." Myers-Briggs Type Indicator Isabel Myers, an early pioneer of psychometric formalized these ideas and proposed that the mixture of types in an individual's personality could be measured through responses to a personality test she devised along with her mother, Katharine Cook Briggs, the Myers-Briggs Type Indicator. In this model, four "dichotomies" are defined, each labelled by two letters (one for each of the opposites in question), as shown by the emboldened letters in the table. Individuals' personalities fall into sixteen different categories depending on which side of each dichotomy they belong to, labelled by the four applicable letters (for example, an "ENTP" type is someone whose preferences are extraversion, intuition, thinking and perceiving).