Dopamine and acetylcholine are at the heart of another difference in how introverts and extroverts process external stimuli.

Extroverts have blunted dopamine receptors, so they need more stimulation to feel pleasure.

Introverts have heightened dopamine receptors, so they feel overwhelmed more easily.

This leads them to seek out activities and behaviors that generate acetylcholine, which creates feelings of tranquility and calm.

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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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