... to earlier work conducted by Anthony Gale and Eysenck, both of whom researched personality and its effect on the electrical activity carried out by the brain. It has been proposed that it is the brain that determines our personality, though it is unclear to which part of the brain is responsible. According to Eysenck there are three predominant personality types- extraversion, neuroticism and psychoticism. Pervin (1993) explained that Eysenck and Long (1986) had considerable evidence found in studies of different cultures, which supported the existence of these three dimensions. The one that we have chosen to focus on and study is that of extraversion. There are two aspects of extraversion, an individual who scores quite low on a scale of extraversion is said to be introverted (quiet) whereas someone who scores quite high is considered an extrovert (loud). It is unclear as to which particular part of the brain is involved ...

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