You might have already identified yourself between being an introvert or extrovert. For this part, our brain plays a part in shaping our personalities, that includes what is exciting or boring to us.
Introverts are thought to be shy and quiet people. Introverts may be quiet people as they most of the time drown in their own thoughts. They are selective in conversations they want to participate in, but they are not necessarily shy people contrary to the popular belief. Introverts gain energy by being alone. Extroverts on the other hand are 'the out there' kind of people. Being with other people magnifies an extrovert's own energy source.
But why do we have introverts and extroverts in the first place? How can we have such contrasting personalities, yet so common among people?
Yes, introversion and extroversion are like the 'main children of personalities'. It's a spectrum of personalities. We are all somewhere in the spectrum.
Researchers have long studied the differences between how the brain of an introvert and an extrovert work.
Someone is in a certain level or boredom and most are in all levels of excitement.
Introverts and Extroverts Respond to Different Stimuli in Different Levels
What excites an extrovert, does not necessarily excite an introvert and vice versa. Scientists found out that it has something to do with dopamine, the neurotransmitter that is responsible in the control of the brain's reward and pleasure system.
In 2005, group of researchers in University of Amsterdam studied the groups who were already identified as introverts or extroverts
via a personality test. Researchers found out that in extroverts and introverts' two regions of the brain, the amygdala and the nucleus accumbens exhibited different responses. Amygdala is responsible for emotional response while the nucleus accumbens is responsible for rewarding and reinforcing stimuli.
Being alone excites me. Oh wait...
Researchers monitored the brain while participants gambled. The result showed extroverts have high responses to these areas of the brain. This implies that extrovert responds strongly to taking risks, trying new things and seeking adventures. That also explains why what seems to be exciting to an extrovert may not be as stimulating to an introvert. Reading a good book or staring out into the ocean may be more exciting to an introvert than clubbing and meeting new people.
The excitement that we know may be defined by extroverts, but introverts may have defined the 'chill'.
See: Brain ‘Clipboard’ State of Memory Discovered in a Cognitive Switch State!