Inside Out: Nature And Nurture

• This chapter is a look at the different biological differences that place people where they are on the introvert/extrovert spectrum.

No matter what someone’s behavior is, it will always start from a baseline that their biology has set.

• The first biological difference is that introverts have denser brain matter in the prefrontal cortex, which is where analysis, ruminating, decision- making, and planning take place.

In fact, it’s where most stereotypical introverted behaviors take place.

It also explains why introverts are said to be focused more on their internal worlds versus the external world— because they are literally stuck in their thoughts more than extroverts.

To support this, extroverts were shown to have increased blood flow to areas involved in sensory processing, which allows them to focus on their external world.

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Peter Hollins is a bestselling author, human psychology researcher, and a dedicated student of the human condition.

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