Personality has a significant influence with a person's thoughts, actions, motivations, emotions and interpersonal relations. It is a generalised term to describe the many different characteristics, or traits people have that make up what is a person's personality. Peterson (1997) defines personality as, "psychological characteristics of an individual that are general, enduring, distinctive, integrated and functional". (Peterson, 1997, p.440). One of the most influential trait theorists has been Hans Eysenck. Ryckman (1993) cites Eysenck's definition of personality as "…showed first 75 words of 1889 total…

…showed last 75 words of 1889 total…the sum of it's achievements." (Shackleton, 1984, p. 63). The common belief that there are significant differences between extraverts and introverts suggest that extremes would be easily found between these two traits of personality. However, these experiments found no such evidence to support the four hypotheses investigating this possibility. It did however, suggest that more attention to laboratory conditions and technique may have resulted in reflecting a more accurate representation in the differences between extroversion and introversion.