The Eysenck personality theory is based on the four classic temperaments (melancholic, choleric, phlegmatic, and sanguine) which Wilhelm Wundt integrated in the two dimensions of neuroticism and extraversion. Neuroticism covers the melancholic and choleric temperaments as a personality trait, i.e., a disposition-oriented tendency to react too emotionally in certain situations. Neuroticism, or emotionality, is the most distinct of Eysenck's personality traits. It was also historically the first trait he defined. Thus, the Maudsley Medical Questionnaire (MMQ) was constructed to measure the personality trait of neuroticism. The MMQ contained 40 items. To cover both neuroticism and extraversion, the Maudsley Personality Inventory (MPI) was developed in 1956. A short version of the MPI containing six neuroticism items was published by Eysenck in 1958. The Eysenck Personality Inventory (EPI) was developed by Eysenck and Eysenck in 1959. In this version, a Lie subscale was included to evaluate the respondent's test-taking behavior, i.e., the extent to which the individual was "faking good." The Eysenck Personality Questionnaire (EPQ) (Eysenck and Eysenck 1975) should be considered as the final measure of the Eysenck personality traits of neuroticism, extraversion (Bech 2017a), or psychoticism (Bech 2017b), still including the Lie subscale with 21 items. However, Eysenck et al. (1985) ultimately published a revised version (EPQ-R) in which one single extra item concerning the neuroticism scale was added to the 1975 version, but this item is of doubtful validity and is not included in the short-scale EPQ-R (Table 1). The Lie subscale in the EPQ-R was the unchanged 21-item version.