Personality: Extraversion vs Introversion

Looking into the biological domain of personality, some of the most interesting research is one the topic of Extraversion vs Introversion. This is something everyone can relate to in their everday activities, with the people we meet. On both extremities, we normally fall in between both, we will take a closer look on the differences between extroverted and introverted behaviours and what drives and motivates us.

The model of extraversion vs intraversion is measured normally using the Eysenck Personality Questionaire(EPQ). This questionaire will then determine which side of the table we sit on. The differences of these two is shown below;

Eysenck's theory is similar to Jung's theory meant in the same terms. The cause of extrovertedness or introvertedness in the biological domain is due to a neurological activity in a part of the brain called Ascending Reticular Activating Syndrome(ARAS).

It is shown that introverts have a high level of activity in the brain's ARAS, that is why, with such they avoid additional external stimulation. People strive to constantly keep the ARAS at an optimal level, that is why introverts work to decrease and avoid stimulation; extoverts works the opposite.

What motivates an extrovert and introvert? Personality is based on a two hypothesized brain systems, they are know as;

1. Behavioral Activation System(BAS)
- cues are rewards (regulates approach behavior, acts on impulses)
- sensation seeking behaviors = HIGH + Impulsivity

2. Behavioral Inhibition System(BIS)
- cues are punishment (regulates avoidant behavior, constant uncertainty)
- sensation seeking behaviors = LOW + Avoidance

By knowing what motivates us and which inclination arre we at, it will help us regulate behavior and choose our actions wisely with some predictability in the outcomes.