In extending the Pavlovian theory on properties of the nervous system to human subjects，Teplov and Nebylitsyn stressed the importance of the development of techniques and laboratory methods for diagnosing the basic properties of the nervous system. They intended to study nervous system properties by laboratory investigation of vegetative and motor responses which are thought to reflect the basic properties of the nervous system. An important finding by Teplov and Nebylitsyn was that strength of excitation is inversely related to sensitivity of the nervous system. The Pavlovian concepts of excitation and inhibition and that of balance between the two processes
were used by Eysenck (1947，1957) as the main neurological constructs，he explained
the physiological basis of extraversion / introversion. Strelau (1972 b) developed a questionnaire，the Strelau Temperament Inventory (STI). The STI consists of three scles which are named in accordance with Pavlovian terms and which refer to individual behaviour in social and work situations that might be determined by
the hypothetical properties of the nervous system. A deeper analysis of the separate personality dimensions based on the cncept of arousal / activation shows that they often refer to the same phenomena，such as，for example，speed of conditioning，sensory threshold，amplitude of AEP，and so forth.